Randomly assign a value to each column of a matrix

Question

Peter Harrington 2019-6-17

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https://ww2.mathworks.cn/matlabcentral/answers/467565-randomly-assign-a-value-to-each-column-of-a-matrix

编辑： dpb 2019-6-18

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

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Answer 1

dpb 2019-6-18

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Not way subscript expansion works as written...use

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

instead

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Peter Harrington 2019-6-18

Thanks for the help, your code works great!

dpb 2019-6-18

编辑：dpb 2019-6-18

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... :) )

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