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How to save a matrix as text file?

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I want to save a matrix as text file.
Each column should be separated by tab.
The output file should be read with any text editor
When the output is opened, it should display the numbers
in the same way it looks like in Matlab.
Thank you for your help
Emerson

Accepted Answer

Matt Fig
Matt Fig on 28 Mar 2011
One way is to use FPRINTF.
A = round(rand(6,7)*9) % Write this to file.
fid = fopen('Mymatrix.txt','wt');
for ii = 1:size(A,1)
fprintf(fid,'%g\t',A(ii,:));
fprintf(fid,'\n');
end
fclose(fid)
EDIT
Changed the 'w+' to 'wt' in the FOPEN call.
If you have floating point numbers, you may want to use '%20.18f \t' instead of '%g\t' or similar. See FPRINTF for format specifiers.

More Answers (3)

Sean de Wolski
Sean de Wolski on 28 Mar 2011
doc dlmwrite
doc fwrite
  2 Comments
Walter Roberson
Walter Roberson on 13 Jul 2019
writematrix() did not exist in 2011 when the answer was posted.

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Walter Roberson
Walter Roberson on 16 Dec 2017
You could also consider dlmwrite telling it to use \t as the delimiter.
You could also consider using
save('MyMatrix.txt', 'A', '-double', '-tab')
Where A is the name of the variable
  3 Comments
Walter Roberson
Walter Roberson on 5 Feb 2019
double precision. Without the -double only about 7 digits are written out, about as much as needed to reproduce single precision numbers.

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