simple way to multiply varying parameter with matrice

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steffen seligmann
steffen seligmann 2020-9-23
回答： Ameer Hamza 2020-9-23
Hello,
My goal is to to diag() my matrice and then plot the eigenvalues over the parameter. since both *, .* are not helpful in this situation is there any very simple way to archieve my goal without having to use any for loops or such?
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steffen seligmann
steffen seligmann 2020-9-23
like, i have a parameter param = 0:0.1:2 and matrice A. Now i want to do sth like multiply each element of param with A and diag() the resulting matrice B to then plot(param,B) for each element of param.

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Ameer Hamza
Ameer Hamza 2020-9-23
Try this
A = rand(2,2);
param = 0:0.1:2;
M = arrayfun(@(x) {x*A}, param);
M = blkdiag(M{:});
It multiplies A with all values in param and places the output on diagonals of matrix M.

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