MATLAB: Fwrite and fread: different dimensions for the same matrix

fwrite fread save bin matrix

Please

I’m trying to save a 2160×4320 matrix as

>> fid = fopen([Path filename '.bin'],'wb');

>> fwrite(fid,filename,'uint8');

>> fclose(fid);

% with Path and filename = char

But it only saves a 12×1 vector, where am I wrong?

Thank you in advance

Best Answer

Because you're writing out the filename string , not the matrix.

Try

fwrite(fid, yourMatrix,'uint8');

By the way, since this appears to be a uint8 image, why not use imwrite() and use a standard image file format such as PNG? Why use .bin and fwrite()?

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MATLAB: Am I having trouble reading an ascii file in notepad that I produced using FPRINTF

Using the following syntax will open the file in text mode, allowing it to be read in notepad:

fid=fopen('out.txt','wt');
fprintf(fid,'%i\n',3);
fclose(fid)

This is because of the "t" flag in the FOPEN statement. Without the "t" flag, the ascii file produced will only print one newline character, while PC standard ASCII files expect two different characters, '/r/n'.

This can be demonstrated by the fact that the following syntax also works:

fid=fopen('out.txt','w');
fprintf(fid,'%i\r\n',3);
fclose(fid)

For more information on the FOPEN function, see:

http://www.mathworks.com/access/helpdesk/help/techdoc/ref/fopen.shtml

MATLAB: Fwrite

Hi Tor,

1) you save strings 2,4, not values (pass [2 4] instead of '2 4' to fwrite

2) you should pass the format ('double'), see fwrite doc

Titus

Best Answer

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MATLAB: Am I having trouble reading an ascii file in notepad that I produced using FPRINTF

MATLAB: Fwrite

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