MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. For information regarding permission(s), write to: Rights and Permissions Department, Pearson Education, Inc., Upper Saddle River, NJ 07458. 100 200 300 400 500 100 200 300 400 500 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 -5 -4.5 -4 -3.5 -3 -2.5 -2 -1.5 -1 -0.5 0 Rate of Change time, hour Rate of temperature change, degrees/hour User-Controlled Input and Output Chapter 7
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MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval system, or
transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. For information regarding permission(s), write to: Rights and
Permissions Department, Pearson Education, Inc., Upper Saddle River, NJ 07458.
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MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval
system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. For information regarding permission(s), write to:
Rights and Permissions Department, Pearson Education, Inc., Upper Saddle River, NJ 07458.
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Objectives
After studying this chapter you should be able to:
• Prompt the user for input to an M-file program
• Create output using the disp function
• Create formatted output
• fprintf
• sprintf
• Use graphical techniques to provide program input
• Use cell mode to modify and run M-file programs
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval
system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. For information regarding permission(s), write to:
Rights and Permissions Department, Pearson Education, Inc., Upper Saddle River, NJ 07458.
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Section 7.1
User Defined Input
• To this point we have “hard
coded” the values of variables into
our M-file programs
• The input function allows us to
prompt the user to enter a value
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval
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The input function is used in an M-file
program to prompt the user to enter a
value
The prompt is displayed
in the command window
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval
system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. For information regarding permission(s), write to:
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MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval
system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. For information regarding permission(s), write to:
Rights and Permissions Department, Pearson Education, Inc., Upper Saddle River, NJ 07458.
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Input accepts a variety of
data
• Scalars
• Matrices
• enter inside square brackets
• Character strings
• enter inside single quotes
• Or… specify string input with ‘s’
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval
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Matrix input
Character
input
Run this program twice more –
once with numeric input and
once with character input
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval
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100 200 300 400 500
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Indicates that the input should be
interpreted as a string
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval
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Section 7.2
Output Options
• Enter the name of a variable
• Use the disp function
• Use the fprintf function
• Use the sprintf function
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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disp
The display
(disp) function
can be used to
display the
contents of a
matrix without
printing the
matrix name
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval
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The disp function can also
be used to display a string
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval
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Strings are really arrays of
character information
The result is a character
array
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval
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You can combine disp functions to create
meaningful output from an M-file program,
but the result of each disp function is on a
separate line.
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval
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Since the disp function only takes one
input, you must combine arrays to make
more complicated output
• Use the num2str(x) function to
change numeric information to a
string
disp(['The values in the x array are: ' num2str(x)])
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval
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Although these characters look like
numbers, they are interpreted by the
computer as part of a character array
– they no longer have any numeric
meaning
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval
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Hint
• If you want to include an apostrophe in a string, you need to enter the apostrophe twice.
• If you don’t, MATLAB thinks the apostrophe terminates the string. For example:
disp('The moon''s gravity is 1/6th that of the earth')
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval
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This MATLAB program mimics a
conversation, by using the input and
disp functions.
Watch the interactions as it runs in the
next slide
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval
system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. For information regarding permission(s), write to:
Rights and Permissions Department, Pearson Education, Inc., Upper Saddle River, NJ 07458.
100 200 300 400 500
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0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
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Formatted Output
• fprintf gives you more control over
your output than the disp function
• You can combine text and
numbers
• You can control how many digits
to display, and their position
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval
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fprintf Arguments
• format-string
• includes place holders and
formating information for numbers
• list of matrices
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval
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fprintf
• The fprintf command is more
flexible than the disp command,
and allows you to put both
variables and text onto the same
line
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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Specifier Description
%c Single character
%d Decimal notation (signed)
%e Exponential notation
%E Exponential notation
%f Fixed-point notation
%g The more compact of %e and %f. Insignificant zeros do not
%s String of characters
%u Decimal notation unsigned
Common format specifier notation for fprintf
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval
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Place holder for
your variable value Variable
8 total spaces
2 after the decimal point
floating point format
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval
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You can also use exponential
format
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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X is a matrix
/n is a carriage return
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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Despite the way it looks, the computer
always considers a matrix as one big list,
working down one column at a time
This example was created on the
student edition of MATLAB – Notice that
the prompt is EDU
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Hint
• One of the most common
mistakes new programmers make
is to forget to include the f in the
placeholder sequence. The fprintf
function won’t work, but no error
message is returned either.
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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Hint
• If you want to include a percentage sign in an fprintf statement, you need to enter the % twice. If you don’t, MATLAB thinks the % is a placeholder for data. For example:
fprintf('The interest rate is %5.2f %% \n', 5)
results in:
The interest rate is 5.00 %
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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Here’s another example that
uses the input, disp and
fprintf functions
• Write a program in an M-file that
creates a table of degrees to
radians
• Prompt the user to enter the table
starting value, an increment
between values, and a final value.
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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Input
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Sending formatted output
to a file
• First create and open an empty
output file, and assign it a file
identifier
• Add the file identifier to the first
field in the fprintf function
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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File identifier
any legitimate
MATLAB name will
do
File name
flag that identifies
this as a file to
which we can write
Create and open an output file and assign it a
file identifier
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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r Importing - Exporting data
fopen file permissions
‘r’ Open an existing file for reading only
‘r+’ Open an existing file for reading and writing
‘w’ Delete the contents of an existing file (or create a new file)
and open it for writing only.
‘w+’
Delete the contents of an existing file (or create a new file)
and open it for reading and writing
‘a’ Open an existing file (or create a new file) and open it for
writing only, appending to the end of file.
‘a+’
Open an existing file (or create a new file) and open it for
reading and writing, appending to the end of file.
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Add the file identifier to the first field in the
fprintf function
The result in the command window is the number
of characters in the output string
The output string is sent to the specified file
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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Double clicking on the file name in the current
directory window causes an editing window to open
– which displays the contents of the file
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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r Exporting data
x = 0:0.1:1;
Y = [x; exp(x)];
0.00 1.00000000
0.10 1.10517092
0.20 1.22140276
0.30 1.34985881
0.40 1.49182470
0.50 1.64872127
0.60 1.82211880
0.70 2.01375271
0.80 2.22554093
0.90 2.45960311
1.00 2.71828183
Exp.txt
Functions fopen, fprintf and fclose
File
created in
current
directory
fid = fopen('Exp.txt','w');
fprintf(fid,'%6.2f %12.8f \n',Y);
fclose(fid)
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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sprintf
• The sprintf function is similar to
fprintf
• Instead of just sending the output
to the command window, sprintf
assigns the output a name, and
then sends it to the command
window
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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The result from fprintf is a character count
The result from sprintf is the actual string
Why is this useful?
sprintf could be used to specify a string that is
then used in a graph annotation
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MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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7.3 Graphical Input
• You can enter ordered pairs of x
and y values, by picking them off
a graph
• ginput
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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ginput
• [x,y] = ginput
• Retrieves a set of ordered pairs
from the graph everytime the enter
key is struck
• [x,y]=ginput(n)
• Retrieves n ordered pairs
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Floating
Crosshair
When the ginput function is executed, a floating crosshair
appears on the graph. Each time the enter key is struck,
MATLAB picks the corresponding points off the graph
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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Section 7.4
More Cell Mode Features
• Publish
• Value Manipulation
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M-files that use cell mode, such as
this one used to solve homework
problems from chapter 5, can be
published using MATLAB’s publish
feature
Publish Icon
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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Results published in HTML
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To publish in a different format, such as Word or
PowerPoint, change the publish configuration
From the file
menu select
File→Publish Configuration for…
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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Rights and Permissions Department, Pearson Education, Inc., Upper Saddle River, NJ 07458.
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Value Manipulation Tools
Increment and
decrement value Divide and
multiply value
This is the number that is
changed, because of the
cursor placement
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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Section 7.5 Reading and Writing Data from
Files
• Some common types of data files
are
• dat
• txt
• xls
• jpg
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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Import Wizard
• Use the import wizard to
determine the data type and to
suggest ways to represent the
data
• Launch from the file menu
• From the uiimport funtion
• uiimport(‘filename.extension’)
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval
system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. For information regarding permission(s), write to:
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MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval
system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. For information regarding permission(s), write to:
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The Import Wizard
To import ASCII data, you must know how the data
in the file is formatted.
For example, many ASCII data files use a fixed (or
uniform) format of rows and columns.
3-84
(continued …)
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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The Import Wizard (continued)
For these files, you should know the following.
• How many data items are in each row?
• Are the data items numeric, text strings, or a
mixture of both types?
• Does each row or column have a descriptive
text header?
• What character is used as the delimiter, that is,
the character used to separate the data items in
each row? The delimiter is also called the
column separator.
(continued …) 3-85
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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The Import Wizard (continued)
You can use the Import Wizard to import many types
of ASCII data formats, including data on the
clipboard. When you use the Import Wizard to create
a variable in the MATLAB workspace, it overwrites
any existing variable in the workspace with the same
name without issuing a warning.
The Import Wizard presents a series of dialog boxes
in which you:
1. Specify the name of the file you want to import,
2. Specify the delimiter used in the file, and
3. Select the variables that you want to import.
3-86
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. For information regarding permission(s), write to:
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MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval
system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. For information regarding permission(s), write to:
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MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval
system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. For information regarding permission(s), write to:
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Command line approaches
• The import wizard requires
interaction with the user
• MATLAB includes a series of
import functions that automatically
import the data
• You need to know what the data
type is before you can use these
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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Import functions
• To import a .mat or .dat file, use the load command
• Other functions can be found if you type
• doc fileformats
• For example, wavread can be used for wav files
• xlsread can be used for Excel files
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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Data Format Sample
File Extension
Matlab function
1 2 3 4 5
6 7 8 9 10
.txt .dat
or other
load
1; 2; 3; 4; 5
6; 7; 8; 9; 10
or
1, 2, 3, 4, 5
6, 7, 8, 9, 10
.txt .dat .csv
or other
dlmread
or
csvread
Ann Type1 12.34 45 Yes
Joe Type2 45.67 67 No
.txt .dat
or other
textread
or
fscanf
Grade1 Grade2 Grade3
91.5 89.2 77.3
88.0 67.8 91.0
67.3 78.1 92.5
.txt .dat
or other
textread
or
fscanf
Importing data - Summary
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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Exporting Data
• Use the save function for .mat or
.dat files
• Use specialized functions for
other file types
• For example
• xlswrite for Excel files
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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• Use the file menu to save a file
interactively, using a variety of file
formats
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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r Importing data (more…)
Function xlsread reads MS Excel files
Syntax: num = xlsread(filename)
num = xlsread(filename, -1)
num = xlsread(filename, sheet, 'range‘ )
num = xlsread(filename The filename argument is a string enclosed
in single quotes.
num = xlsread(filename, -1) opens the file filename in an Excel
window, enabling you to interactively select the worksheet to be read
and the range of data on that worksheet to import.
num = xlsread(filename, sheet, 'range') reads data from a specific
rectangular region (range) of the worksheet specified by sheet.
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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r Importing data (more…)
Example: xlsread
A = xlsread('testdata1.xls')
A =
1 6
2 7
3 8
4 9
5 10
1 6
2 7
3 8
4 9
5 10
testdata1.xls
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. For information regarding permission(s), write to: Rights and
Permissions Department, Pearson Education, Inc., Upper Saddle River, NJ 07458.
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0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
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time, hour
Ra
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s/h
ou
r Importing data (more…)
Example: xlsread
A = xlsread('testdata1.xls‘,-1)
A =
1 6
2 7
3 8
4 9
5 10
1 6
2 7
3 8
4 9
5 10
testdata1.xls
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval system, or
transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. For information regarding permission(s), write to: Rights and
Permissions Department, Pearson Education, Inc., Upper Saddle River, NJ 07458.
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100
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400
500
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
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-1
-0.5
0
Rate of Change
time, hour
Ra
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ch
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, d
eg
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s/h
ou
r Importing data (more…)
Example: xlsread
A = xlsread('testdata1.xls',1, 'A4:B5')
A =
4 9
5 10
1 6
2 7
3 8
4 9
5 10
testdata1.xls
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval system, or
transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. For information regarding permission(s), write to: Rights and
Permissions Department, Pearson Education, Inc., Upper Saddle River, NJ 07458.
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500
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
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Rate of Change
time, hour
Ra
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ch
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, d
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s/h
ou
r Exporting data (more…)
Function xlswrite
Syntax: xlswrite(filename, M)
xlswrite(filename, M, sheet, 'range')
xlswrite(filename, M) writes matrix M to the Excel file filename. The
filename input is a string enclosed in single quotes. The matrix data is
written to the first worksheet in the file, starting at cell A1.
xlswrite(filename, M, sheet, 'range') writes matrix M to a rectangular
region specified by range in worksheet sheet of the file filename.
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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time, hour
Ra
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r Exporting data (more…)
Example: xlswrite
xlswrite('testdata', [12.7 5.02 -98 63.9 0 -.2 56])
d = {'Time', 'Temp'; 12 98; 13 99; 14 97};
s = xlswrite('tempdata.xls', d, 'Temperatures', 'E1')
Time Temp
12 98
13 99
14 97
tempdata.xls
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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7.6 Debugging Your Code
The moth found trapped between a relay in Harvard’s MarkII
Aiken Relay Computer – Image courtesy of the Naval
Surface Warfare Center
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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The Error Bar The Error
Bar
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval
system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. For information regarding permission(s), write to:
Rights and Permissions Department, Pearson Education, Inc., Upper Saddle River, NJ 07458.
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MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval
system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. For information regarding permission(s), write to:
Rights and Permissions Department, Pearson Education, Inc., Upper Saddle River, NJ 07458.
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Set/clear
breakpoint icon Continue to next
breakpoint
Step icon
Breakpoint
The execution is
paused here
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval
system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. For information regarding permission(s), write to:
Rights and Permissions Department, Pearson Education, Inc., Upper Saddle River, NJ 07458.
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Step in Step out
Arrange
documents
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval
system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. For information regarding permission(s), write to:
Rights and Permissions Department, Pearson Education, Inc., Upper Saddle River, NJ 07458.
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Summary
• The input function allows the user
to interact with the program by
entering data at a prompt
• The disp function displays
information in the command
window, and is especially useful
for titles and labels
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval
system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. For information regarding permission(s), write to:
Rights and Permissions Department, Pearson Education, Inc., Upper Saddle River, NJ 07458.
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Summary - fprintf
• The fprintf function is more
versatile than the disp function
and allows you to combine text
and numeric information in
formatted output
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval
system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. For information regarding permission(s), write to:
Rights and Permissions Department, Pearson Education, Inc., Upper Saddle River, NJ 07458.
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Summary sprintf
• sprintf is similar to fprintf
• It allows you to save formatted
output to a variable name, for later
use in your program
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval
system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. For information regarding permission(s), write to:
Rights and Permissions Department, Pearson Education, Inc., Upper Saddle River, NJ 07458.
100 200 300 400 500
100
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300
400
500
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Summary - ginput
• The graphical input function
allows the user to pick information
off a graph, and store it as a
series of ordered x-y pairs
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval
system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. For information regarding permission(s), write to:
Rights and Permissions Department, Pearson Education, Inc., Upper Saddle River, NJ 07458.
100 200 300 400 500
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200
300
400
500
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Summary – Cell Mode
• Cell mode allows the programmer to
group M-file code into sections, and to
run each section individually
• It includes options to publish M-files in
html, Word or PowerPoint formats
• The cell toolbar allows the user to
interactively change parameter values
each time the code is executed
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval
system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. For information regarding permission(s), write to:
Rights and Permissions Department, Pearson Education, Inc., Upper Saddle River, NJ 07458.
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100
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300
400
500
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Summary – Importing and
Exporting Data
• MATLAB includes a number of
specialized import functions
optimized for a variety of file
formats
• Companion functions allow data
to be exported in the same file
formats
MATLAB for Engineers 3E, by Holly Moore. © 2011 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
This material is protected by Copyright and written permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval
system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. For information regarding permission(s), write to:
Rights and Permissions Department, Pearson Education, Inc., Upper Saddle River, NJ 07458.
100 200 300 400 500
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400
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Summary – Debugging
Tools
• MATLAB includes debugging
tools that make it easier for you to
find programming errors in your
code
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