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Write a 2D character array to textual file

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Marko Gulin
Marko Gulin 2017-9-6
编辑： Marko Gulin 2017-9-6
Hy everyone,
What would be the best way in terms of computational time to write a 2D character array from Matlab to a textual file?
I've used this:
dlmwrite('file.txt', data, '');
but it is too slow.
I want to write a 2D character array so that each array row is printed on a new line.
Thanks!
  1 个评论
Stephen23
Stephen23 2017-9-6
Probably the fastest way would be to use fprintf directly. Have you tried that?

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采纳的回答

Cam Salzberger
Cam Salzberger 2017-9-6
编辑：Cam Salzberger 2017-9-6
Hello Marko,
The most easily read code would probably be to either stick with dlmwrite, or loop through each row and use fprintf on an open file. However, if you want to avoid loops, you could do it like this:
fid = fopen('test.txt','w');
Anew = [A repmat(newline,size(A,1),1)];
fprintf(fid,'%s',Anew.');
fclose(fid);
Appending newlines on the ends of the rows makes it unnecessary to loop row by row. Transposing the array before writing it is necessary because fprintf works in linear indexing order (column-major).
-Cam
  2 个评论
Stephen23
Stephen23 2017-9-6
编辑：Stephen23 2017-9-6
A slightly clearer way to add the newline:
Anew = A;
Anew(:,end+1) = newline;
Marko Gulin
Marko Gulin 2017-9-6
编辑：Marko Gulin 2017-9-6
Thank you, all of these answers have helped me :)

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