Insert a matrix within a matrix
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Im trying to insert a matrix within a matrix, such that, if
x=[a,d;c,d], then y=[a,b,0,0;c,d,0,0;0,0,a,b;0,0,c,d]. Basically, matrix X becomes the diagonals of of the zero matrix Y.
anyone in cyberland have an idea on how to do this?
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Accepted Answer
the cyclist
on 29 Jan 2011
Matt's solution does precisely what you ask. You might also like to know that in general, you can insert one array into another by indexing on the left-hand side of an assignment statement:
>> x = rand(2);
>> y = zeros(8);
>> y(5:6,3:4) = x;
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More Answers (2)
PUST rahman
on 19 Jun 2012
function R=insertMatrix(B,b)
% INPUT: B: Bigger matrix % b: small matrix that needs to put inside bigger matrix, B %OUTPUT: R: Resultant matrix % Example: % B=zeros(10,10); b=ones(5,5); % R=insertMatrix(B,b);
[P,Q]=size(B);
fx=floor(P/2)-floor(size(b,1)/2);
fy=floor(Q/2)-floor(size(b,2)/2);
R=B;
for p=1:size(b,1)
for q=1:size(b,2)
R(fx+p,fy+q)=b(p,q);
end
end
return;
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PUST rahman
on 19 Jun 2012
The only advantage of this code is it tries to push the small matrix just in the middle of the bigger matrix.
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