How i will choose a random element of a matrix

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Giannakis Stoukas
Giannakis Stoukas 2015-3-24
评论： Walter Roberson 2022-5-21
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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采纳的回答

per isakson
per isakson 2015-3-24
One way
A = rand(3,4)
A( randi([1,size(A,1)],1), randi([1,size(A,2)],1) )
  2 个评论
Assen Beshr
Assen Beshr 2022-5-21
编辑：Assen Beshr 2022-5-21
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];

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更多回答（1 个）

Guillaume
Guillaume 2015-3-24
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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