Saving in txt format in Matlab with commas and semicolons

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MRC on 20 Jan 2015
Commented: Image Analyst on 20 Jan 2015
I have a huge matrix in Matlab that I want to save in .txt format (or in any other text format).
Suppose the matrix is
A =
1 2 3
4 5 6
7 8 9
If I type
save prova.txt A -ASCII
I get the matrix in .txt format as
1 2 3
4 5 6
7 8 9
(in an horrible exponential form, actually)
I would like to get instead
1, 2, 3;
4, 5, 6;
7, 8, 9;
Can you help me? In addition, do you know a way to make the exponential form disappear?

Answers (1)

Image Analyst
Image Analyst on 20 Jan 2015
Edited: Image Analyst on 20 Jan 2015
fid = fopen(filename, 'wt');
if fid ~= -1
for row = 1 : size(A, 1);
fprintf(fid, '%d, %d, %d;\n', A(row, 1), A(row, 2), A(row, 3));
Image Analyst
Image Analyst on 20 Jan 2015
You can pick whatever filename you want.
You must be saving this as a text file. If it was a binary file or a .mat file then you wouldn't care at all about commas and semcolons because you would not see them at all.
If A has a huge number of columns, you can do
outputString = sprintf('%d, ', A(row, :));
% Get rid of final command and space and add a semicolon instead
fprintf('%s;', outputString(1:end-2));

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