Extract diagonal of sparse quadratic form - MATLAB Cody - MATLAB Central

Problem 60754. Extract diagonal of sparse quadratic form

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(90)
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Consider the matrix A and vector v given by,
A=round(sprand(5e3,1e4,1/1e4*100)*100);
v=randi(10,width(A),1);
Write a routine that will return the diagonal of the quadratic form A*diag(v)*A', and which executes on the above inputs in less than 0.03 seconds.
Solve

Solution Stats

50.0% Correct | 50.0% Incorrect
Last Solution submitted on Nov 01, 2024

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quadratic form sparse

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