To pick a number randomly

PK
2012 9 11
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Can some one help in picking a number from a matrix for example i have matrix of the form A=[1 2 3 4 5; 6 6 7 5 8 ; 12 4 5 6 9] and i require to pick only one element randomly from the matrix but should not be the same element every time.

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Andrei Bobrov
Andrei Bobrov 2012-9-11
编辑：Andrei Bobrov 2012-9-11

1 个投票

try this is code
A=[1 2 3 4 5; 6 6 7 5 8 ; 12 4 5 6 9];
a = unique(A);
b = a(histc(A(:),a) < 2);
idx = randperm(numel(b));
out = b(idx(1));

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PK
PK 2012-9-11
its working fine can u please elaborate the working of code

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Rene
Rene 2012-9-11
编辑：Rene 2012-9-11

1 个投票

The answer of andrei does not give a truly random number since he uses the unique command.
This will:
A=[1 2 3 4 5; 6 6 7 5 8 ; 12 4 5 6 9];
B = round((length(A(:))-1)*rand+1);
A(B)
ps. as far as rand returns a truly random number

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PK
PK 2012-9-12
this works fine and any method to select the numbers accordingly from first row first element to third row fifth element one after the other continuously in the manner of 1 2 3 4 5 6 6 7 5 8 12 4 5 6 9
Andrei Bobrov
Andrei Bobrov 2012-9-12
编辑：Andrei Bobrov 2012-9-12
A2 = reshape(A',[],1);
out = A2(randperm(numel(A),1));

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