Use of fopen in for loop

I want to create data file in matlab. for single array i have written:

fid = fopen('uN.dat','w');
fprintf(fid,'%6.8f\n',reshape(a,20000,1)');
fclose(fid) ;

suppose a is a 128x20000 matrix and i want to create data file for each of the row. that means my I want 128 data file each consisting of 1x20000 matrix and their name will be like uN1,uN2....uN128.

then certainly I need a for loop. how to do that?

Answer 1

[dpb]

See the FAQ <How_can_I_process_a_sequence_of_files?>

While this was written with the idea of reading files, it's perfectly valid for writing as well. You'll just use

fprintf(fid,'%6.8f\n',a(:,idx))

in the loop to select a given column each pass.