Selecting randomly from matrix

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FIR
FIR 2012-7-25
I have a matrix B =
2 5 6
8 9 10
56 89 10
1 0 3
8 1 3
in this i want to select a 2x2 matrix randomly ,please tell how to select

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回答（2 个）

Andrei Bobrov
Andrei Bobrov 2012-7-25
编辑：Andrei Bobrov 2012-7-25
adjacent values
B(randi(size(B,1)-1)+(0:1),randi(size(B,2)-1)+(0:1));
not adjacent values
ii = randperm(size(B,1));
jj = randperm(size(B,2));
B(sort(ii(1:2)),sort(jj(1:2)))
Thomas
Thomas 2012-7-25
perhaps something like this..
q=[ 2 5 6
8 9 10
56 89 10
1 0 3
8 1 3]
row=randi(4); %select start row
col=randi(2); %select start colums
out=q(row:row+1,col:col+1)

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