How can one create this matrix?

Question

0 个投票

I want to create a matrix like

That is, I start from

grids=1:1:5

and I want to repeat this "grids" in the second column. Please advise.

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Answer 1

madhan ravi 2020-7-24

0 个投票

 [X, Y] = meshgrid(1:5);
 [X(:), Y(:)]

Answer 2

Alan Stevens 2020-7-24

0 个投票

This will do it:

n = 5; reps = 4;
c1 = ones(n,1)*(1:reps); c1 = c1(:);
c2 = (ones(reps,1)*(1:n))'; c2=c2(:);
M = [c1 c2];

Alan Stevens 2020-7-24

编辑：Alan Stevens 2020-7-24

You are right that there are probably easier ways to do it (use of meshgrid would indeed be better, but I just didn't think of it!)

The first column doesn't have a 5 in it because it wasn't clear to me that the op wanted the same number of repeats as grids.

alpedhuez 2020-7-24

Thank you any way.