Using fprintf for csv in matlab

Question

I would like to generate a csv file with a header and some data. Since I am on a Mac, this does not work using csvwrite, so I need to use fprintf.

I am storing my headers in a cell array called header (header = 'AB' 'CB'). Whatever I am trying I get an error:

Error using fprintf

Function is not defined for 'cell' inputs.

Can somebody make an easy example with the header example?

score 0 · Accepted Answer · answered Apr 10 '14 at 15:58

Something like this should work,

headers ={'Header1','Header2','Header3'};
fh = fopen('SomeFile.csv','w');
for ii = 1:numel(headers)
   if ii == 1
      fprintf(fh,headers{ii});
   else
      fprintf(fh,[',',headers{ii}]); 
   end
end
randVals = rand(5,3);
for ii = 1:size(randVals,1)
       fprintf(fh,'\n');
    for jj = 1:size(randVals,2)
        if jj == 1
            fprintf(fh,num2str(randVals(ii,jj)));
        else
            fprintf(fh,[',',num2str(randVals(ii,jj))]);
        end
    end
end
fclose(fh)

You just need to separate out the headers and do the manual grunt work that csvwrite would normally do for you.

Using fprintf for csv in matlab

1 Answers1