dlmwrite alternatives when the matrix size is large

I have a matrix(point cloud) of size 379422x3 and it takes around 20 secs to write it to a text file. I'm looking for quicker ways of writing this data to a text file. Any suggestions

[Dara Parsavand]

I have run into this before but forgot that fprintf is much much faster. In my case I wanted to write out a 240e6x1 and I got tired of waiting after 20 minutes. fprintf finished before I realised (a few minutes at the most).

In your case, I just ran:

tic
M = rand(379422,3);
fid = fopen('test.txt','w');
fprintf(fid, '%d, %d, %d\n', M(:, 1), M(:, 2), M(:, 3));
fclose(fid);
toc

which finished in 0.63 sec

You can modify the format line (using tabs over comma). There is surely another way to do this that dosn't involve hardcoding the number of columns but it works and in my case I only needed one column.