MATLAB: Writing Header for csv overwrites data in csv

Question

Hi!

I have a 138×2 matrix A, which I save as a csv:

csvwrite('A.csv',A);

Now I want to add for each column a header, the csv at the end should have a 139×2 format. The first header is called "PIN", the second "Pred". However when I use the following code, all my data from above is overwritten, and only the headers are left! What am I doing wrong?

cHeader = {'Pin' 'Pred'}; %dummy header
commaHeader = [cHeader;repmat({','},1,numel(cHeader))]; %insert commaas
commaHeader = commaHeader(:)';
textHeader = cell2mat(commaHeader);
fid = fopen('A.csv','w'); 
fprintf(fid,'%s\n',textHeader);
fclose(fid);

Answer 1

fid = fopen('A.csv', 'wt');
fprintf(fid, '%s,%s\n', 'Pin', 'Pred');
fprintf(fid, '%g,%g\n', A.');   %transpose is important!
fclose(fid);