matrix concatenation

9 views (last 30 days)
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)].');
Warning: the details of the fprintf() call depend upon col1 and col2 being column vectors!
Baba on 21 Feb 2012
Perfect thank you!

Sign in to comment.

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
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.

Sign in to comment.

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by