Manipulate matrix of different dimension

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kamal
kamal 2019-8-14
回答： Andrei Bobrov 2019-8-14
I have a matrix like this
q2.PNG
I want to create a square matrix of size 5. At first row of matrix 1 only element 1 is present. using that element i want matrix as m1 -m1 at 1st and second position of first row in matrix 2.
q1.PNG
Please help me the logic

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Andrei Bobrov
Andrei Bobrov 2019-8-14
mm = [0 0 1;1 2 5;0 2 3 ;0 3 4; 0 4 5];
m = size(mm,1);
n = max(mm(:));
lo = eye(m,n) ~= 0;
M = zeros(m,n);
[ii,~,v]=find(mm);
M(sub2ind([m,n],ii,mm(mm~=0))) = -v;
M = M.*~lo;% or M(lo) = 0;
M = M + M.';
M(lo)=-sum(M,2);

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