How i will choose a random element of a matrix

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Giannakis Stoukas
Giannakis Stoukas le 24 Mar 2015
Commenté : Walter Roberson le 21 Mai 2022
I have a matrix A,and i want to choose randomly an element from the matrix.How i will do that?

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per isakson
per isakson le 24 Mar 2015
One way
A = rand(3,4)
A( randi([1,size(A,1)],1), randi([1,size(A,2)],1) )
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Walter Roberson
Walter Roberson le 21 Mai 2022
L(randi(numel(L), npop, n))

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Guillaume le 24 Mar 2015
It may be (insignificantly) faster to use linear indexing:
It's more succinct anyway, and works whatever the number of dimensions of the array.


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