Separating strings with commas in Matlab

Question

I'm looking to separate strings in a text file with commas in Matlab, so far I've used "csvwrite" and "dlmwrite".

They generally take this form:

myFile - input ('Please enter file's directory','s');
readMatrix - csvread(myFile);
csvwrite('newdatafile.dat', readMatrix);

To clarify, what I am trying to do is this :

Turn a text file that looks like this:

0.3
0.1
0.5
etc

To This:

0.3,
0.1,
0.5,
etc,

Answer 1

Why do you need the commas at the end of the line? csvread works also with a file of which the rows contain comma-separated numbers, i.e.:

file1.dat:
02, 04, 06, 08, 10, 12
03, 06, 09, 12, 15, 18
05, 10, 15, 20, 25, 30
07, 14, 21, 28, 35, 42
11, 22, 33, 44, 55, 66


--and then in matlab:
readMatrix = csvread('file1.dat')

will read the file and result in size(readMatrix) = [5 6] (despite the missing comma at the end of each line) Same thing applies if the file only contains one column of numbers (and hence no commas).

If you however really want the commas, you can read the data and print it to a file yourself with fprintf:

readMatrix = csvread('file1.dat');
fid=fopen('file1withcommas.dat','w');
for ii=1:size(readMatrix,1)
    fprintf(fid,'%g,\n',readMatrix(ii,:));
end
fclose(fid)