Placing Blocks of fixed size to random positions in a bigger matrix

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Bharathwaj
Bharathwaj 2011-11-16
How do you place a smaller matrix(block) of fixed size in a bigger matrix at random positions?

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Andrei Bobrov
Andrei Bobrov 2011-11-16
M = zeros(5)
m = randi(4,3)
sM = size(M);
sm = size(m);
k=sM-sm+1;
iM = reshape(1:numel(M),sM(1),[]);
iw = iM(1:k(1),1:k(2));
im = bsxfun(@plus,(0:sm(1)-1).',0:sM(1):sM(1)*(sm(2)-1));
M(iw(randi(numel(m)))+im) = m

更多回答（1 个）

Fangjun Jiang
Fangjun Jiang 2011-11-16
a=rand(3);
A=magic(10);
[m,n]=size(a);
[M,N]=size(A);
i=floor((M-m)*rand)+1;
j=floor((N-n)*rand)+1;
A(i+1:i+m,j+1:j+n)=a

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