writing maxtrix into a txt file

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Andy
Andy 2012-1-17
I am trying to write a maxtrix into a txt file which contains other information, so i am wondering how i would go about this? could i use dlmwrite, will this write everything in the same file as my other information? Thanks.
p.s. right now i am writing every number in one by one with a nested loop, takes a long time to do since i have a 24000X103 matrix, and also takes forever to open.

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Walter Roberson
Walter Roberson 2012-1-17
dlmwrite() cannot handle a mix of text and numbers. It can handle numbers alone, and it can handle text alone (when backed in to a corner.)
Are you just trying to append a matrix to an existing file? If so then:
thisfmt = [repmat('%g ', 1, size(YourMatrix,2)-1),, '%g\n'];
fid = fopen('YourExistingFile.txt', 'at');
printf(fid, thisfmt, YourMatrix .'); %transpose is critical!
fclose(fid)
Adjust the %g to whatever is appropriate.
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Andy
Andy 2012-1-17
thanks, that worked, just one more question, is there a limit as to how far to the right the txt file can be written? i mean when matlab writes the matrix in, it stopped before it wrote all 24000 numbers in and went to the next line and then continued there
Walter Roberson
Walter Roberson 2012-1-17
The above code will write 24000 rows each containing 103 columns -- "row major order".
Did you want to write by columns across rather than by rows?
thisfmt = [repmat('%g ', 1, size(YourMatrix,1)-1),, '%g\n'];
fid = fopen('YourExistingFile.txt', 'at');
printf(fid, thisfmt, YourMatrix); %NO transpose!
fclose(fid)

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