MATLAB: How to use the NULL file in MATLAB 7.3 (R2006b)

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I would like to use the NULL file from MATLAB to suppress output to the screen. In earlier releases of MATLAB I would use the file identifier of 0 for this purpose.

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Prior to MATLAB R2013b, the syntax for opening a NULL file on Windows is:

null = fopen('NUL:')

On UNIX/Linux the NULL file is opened by using:

null = fopen('/dev/null')

To open a NULL file using MATLAB R2013b on Windows, the syntax is:

null  =  fopen('NUL ')

Please note that there is now a space between the "L" and the terminating apostrophe.

The returned file identifier can be used in FPRINTF or FWRITE.

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MATLAB: How to open a NULL file on Windows in R2013b

To open a NULL file using MATLAB R2013b on Windows, execute the following command:

fid = fopen('NUL ');

Please note that there is now a space between the "L" and the terminating apostrophe.

Prior to MATLAB R2013b, the syntax for opening a NULL file on Windows was:

fid = fopen('NUL:');

MATLAB: How to read only a specific line while reading a text file in MATLAB

Use the following sample code to read only a specific line from a text file into MATLAB:

>> % open the file
>> fid=fopen('R2CameraDetectionParam.txt'); 
>> % set linenum to the desired line number that you want to import
>> linenum = 3;
>> % use '%s' if you want to read in the entire line or use '%f' if you want to read only the first numeric value
>> C = textscan(fid,'%s',1,'delimiter','\n', 'headerlines',linenum-1);

If you wish to read more lines remember to reset the file pointer to the start of the file by using the following command :

>> fseek(fid,0,'bof');

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Related Solutions

MATLAB: How to open a NULL file on Windows in R2013b

MATLAB: How to read only a specific line while reading a text file in MATLAB

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