how to setup matrix with random unique combinations

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Pablo
Pablo 2011-5-23
Hello, in a M = 4x4 matrix I want to place 1 unique value (x=1) per column so that sum(M,2) = 1: e.g., [1 0 0 0; 0 0 0 1; 0 1 0 0; 0 0 1 0 ]
However the combination has to be randomly made.
I can use randi(4,1) to set up the first column, but the subsequent columns will have to be constrained following the first column and using "while" doesn't seem to help. Sugestions?

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Fangjun Jiang
Fangjun Jiang 2011-5-23
a=eye(4);
b=randperm(4);
c=a(b,:)

更多回答（1 个）

Laura Proctor
Laura Proctor 2011-5-23

If the columns and rows must all sum to 1, then try this:

M = eye(4);
M = M(:,randperm(4));

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