how save produced images in loop

hi i have a loop and produce blocks 32*32 with zeros now i want to save them in special folder how can i do it?

[nadia]

i use this code

for i=1:4
    b=zeros(32,32);
xx=sprintf('F:\b\i%d.bmp',i);
imwrite(b,xx,'bmp');
end

but it says Can't open file "F" for writing. You may not have write permission. please help me

Answer 1

[Geoff Hayes]

Nadia - you are using backslashes in your string which is probably generating the following warnings

 Warning: Control Character '\i' is not valid. See 'doc sprintf' for control characters valid in the format string.

Instead, build the filename separately from the path, and then use fullfile to build the full file name (with path) as

 pathName = 'F:\b';
 for k=1:4
     b = zeros(32,32);
     fileName = fullfile(pathName,sprintf('i%d.bmp',k));
     imwrite(b,fileName);
 end

Your file names will look something like

 F:\b\i1.bmp
 F:\b\i2.bmp
 F:\b\i3.bmp
 F:\b\i4.bmp

Note that I replaced your index of i with k since i (and j) are also used by MATLAB to represent the imaginary number. I also removed the bmp input argument to imwrite since the image file extension has already been specified in the file name.

[nadia]

thank you very much for your helps

[Image Analyst]

Or you can just use forward slashes. Windows understands forward slashes just fine - no need to use backslashes.