Problem 2585. How to reverse spdiags?

The spdiags function extracts all nonzero diagonals from the m-by-n matrix A.
So if
A = [1 2 3;4 5 6;7 8 9]
then
spdiags(A) = [7 4 1 0 0;
0 8 5 2 0;
0 0 9 6 3]
But if I give you spdiags(A), can you give me A ?
Solve

Solution Stats

17.45% Correct | 82.55% Incorrect
Last Solution submitted on Dec 27, 2025

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