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) )
  2 commentaires
Assen Beshr
Assen Beshr le 21 Mai 2022
Modifié(e) : Assen Beshr le 21 Mai 2022
per isakson: perfect . I have one question related to this question. the question is How I choose random value npop X n matrix if npop =5 and n=2; from column matrix L=[2;4;5;7;8;9;12;25;32;33]
for example [4 25
2 7
33 12
32 5
4 9];
Walter Roberson
Walter Roberson le 21 Mai 2022
L(randi(numel(L), npop, n))

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Plus de réponses (1)

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

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