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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the cyclist
le 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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PUST rahman
le 19 Juin 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
le 19 Juin 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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