Randomly assign a value to each column of a matrix

I can't figure out why this code doesn't work. I would like to have one true value in each row that is randomly assigned to a column like so

[1 0 0;
 0 1 0;
 1 0 1;
 0 0 1]
mt = 5;
npart = 3;
seqS = false(mt, npart);
t = randi([1, 3], mt, 1);
seqS(:, t) = true; %should work, why not?

Thanks in advance,

Pete

Answer 1

[dpb]

Not way subscript expansion works as written...use

seqS(sub2ind(size(seqS),[1:mt].',t)) = true;

instead

[Peter Harrington]

Thanks for the help, your code works great!

[dpb]

No problem, glad to help...it's one of those syntax things that superficially does look like should work as you expected but doesn't.

If would, go ahead and Accept answer if for no other reason to indicate to others there is a solution to the question. (And, while I never started this with the intent of garnering points, as of this instant, you'd be the one to hit the 10K mark... :) )