matrix concatenation

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Baba
Baba on 21 Feb 2012
Edited: Anusha on 19 Oct 2013
I need to create a text file with 3 columns. first two columns are of the same size, 100. The 3rd column just has one number in it. How can I do that?

Accepted Answer

Walter Roberson
Walter Roberson on 21 Feb 2012
With col1, col2, and col3 being column vectors:
fmt = ['%f %f %f\n' repmat('%f %f\n', 1, 99)];
fid = fopen('YourOutputFile.txt', 'wt');
fprintf(fid, fmt, col1(1), col2(1), col3(1), [col1(2:end), col2(2:end)].');
fclose(fid);
Warning: the details of the fprintf() call depend upon col1 and col2 being column vectors!
  4 Comments
Baba
Baba on 21 Feb 2012
Perfect thank you!

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More Answers (1)

Sean de Wolski
Sean de Wolski on 21 Feb 2012
Do you want the third column to have 100 values the same?
If so:
A = [c1,c2,repmat(c3,100,1)];
If not:
A = [{c1} {c2} {c3}]
for more info:
doc cell
  3 Comments
Walter Roberson
Walter Roberson on 21 Feb 2012
In order to do it with dlmwrite(), you would have to make two dlmwrite() calls, with the second using the -append option.

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