Files and Simulink

7/30/2019 Files and Simulink

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Load

Load workspace variables from disk

Syntax

Save

Save workspace variables on disk

Graphical Interface

As an alternative to the save function, select Save Workspace As from the File menu

in the MATLAB desktop, or use the Workspace browser.

Syntax

Open

Open files based on extension

Syntax

Description

open('name') opens the object specified by the string name. The specific action

taken upon opening depends on the type of object specified by name.

EngEngEngEng \\\\ Hadeer SobhyHadeer SobhyHadeer SobhyHadeer Sobhy


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Opening a MAT-File



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Fopen

Open a file or obtain information about open files

Syntax

Description

-fid = fopen(filename) opens the file filename for read access. (On PCs, fopenopens files for binary read access.)

- fidis a scalar MATLAB integer, called a file identifier. You use the fid as the firstargument to other file input/output routines.

If fopen cannot open the file, it returns -1.

- fid = fopen(filename, mode) opens the file filename in the specified mode. Themode argument can be any of the following:

Fclose

Close one or more open files

Syntax

Description

- status = fclose(fid) closes the specified file if it is open, returning 0 if successfuland -1 if unsuccessful.



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Argument fid is a file identifier associated with an open file. (Seefopen for a

complete description of fid).

If fid does not represent an open file, or if it is equal to 0, 1, or 2, thenfclose throws

an error.

- status = fclose('all') closes all open files (except standard input, output, and

error), returning 0 if successful and -1 if unsuccessful.

Fprintf

Write formatted data to file

Syntax

Description- count = fprintf(fid,format,A,...) formats the data in the real part of matrix A(and in any additional matrix arguments) under control of the specified format

string, and writes it to the file associated with file identifier fid. fprintf returns a

count of the number of bytes written.



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This table lists the escape character sequences you use to specify nonprinting

characters in a format specification.

Fread

Read binary data from file

Syntax

Description

- A = fread(fid) reads data in binary format from the file specified by fid intomatrix A.

- Open the file usingfopen before callingfread. The fid argument is the integer file

identifier obtained from thefopen operation.

- MATLAB reads the file from beginning to end, and then positions the file pointer

at the end of the file.



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Specifying Precision

Any of the strings in the following table, either the MATLAB version or their C or

FORTRAN equivalent, can be used for precision. If precision is not specified,

MATLAB uses the default, which is 'uchar'.

The following platform-dependent formats are also supported, but they are not

guaranteed to be the same size on all platforms.



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Examples:

Example 1

The file alphabet.txt contains the 26 letters of the English alphabet, all capitalized.

Open the file for read access withfopen, and read the first five elements into outputc. Because a precision has not been specified, MATLAB uses the default precision of

uchar, and the output is numeric:

This time, specify that you want each element read as an unsigned 8-bit integer and

output as a character. (Using a precision of 'char=>char' or '*char' will produce the

same result):

When you leave out the optional count argument, MATLAB reads the file to the

end, A through Z:

Thefopen function positions the file pointer at the start of the file. So the firstfread

in this example reads the first five elements in the file, and then repositions the file

pointer at the beginning of the next element. For this reason, the nextfreadpicks up

where the previousfreadleft off, at the character

EnEnEnEngggg \\\\ Hadeer SobhyHadeer SobhyHadeer SobhyHadeer Sobhy


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Skip two elements between each read by specifying a skip argument of 2:

Fwrite

Write binary data to a file

Syntax

Description

- count = fwrite(fid,A,precision) writes the elements of matrix A to the specifiedfile, translating MATLAB values to the specified precision.

- The data is written to the file in column order, and a count is kept of the number of

elements written successfully.

Examples:



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Programs:

Reading and Writing wave files

Reading and Writing text files



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To open SIMULINK at MATLAB

Then ..



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OR .

Then ..



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Now lets try something a little bit more complicated.First, build the following system (you can find the Clock module in the Sinks category.The Trigonometric Function and Sum modules reside in theMath category):

Output on Time Scope

Now, lets see if the derivative is really a cosine. Build the following system (theDerivative module is located in the Continuous category):



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We can see that this is indeed a cosine, but something is wrong at the beginning.



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1.Low Pass Filter2.High Pass Filter3.Band Pass Filter4.Band Stop Filter5.Resonator Filter6.Notch Filter



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Low Pass Filter

High Pass Filter

Band Pass Filter

Notch Filter

To get filter on simulink as follow:

Signal Processing Blackest >>Filtering>>Filter Design>>Digital Filter Design



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