How i will choose a random element of a matrix

I have a matrix A,and i want to choose randomly an element from the matrix.How i will do that?

Answer 1

[per isakson]

One way

    A = rand(3,4)
    A( randi([1,size(A,1)],1), randi([1,size(A,2)],1) )

[Assen Beshr]

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]

L(randi(numel(L), npop, n))

Answer 2

[Guillaume]

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.