Given a square matrix A of size n, write a function to create a new matrix B where only the elements on the main diagonal and the anti-diagonal are retained. All other elements should be set to zero.
For instance,
A = [1 2 3;
4 5 6;
7 8 9];
B = [1 0 3;
0 5 0;
7 0 9];
Solve

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Last Solution submitted on Jun 06, 2026

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Chris Cleveland Dyuman Joshi Athi Lorenzo

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