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Problem 1704. Triangular matrices in 3D array

Created by Matt Eicholtz

Given a 3D numeric array x, return an array y of the same size in which all entries to the right of the main diagonal are zero for y(:,:,i).

Example

If

x(:,:,1) = 1 2 3
           4 5 6
           7 8 9
x(:,:,2) = 1 4 7
           2 5 8
           3 6 9
x(:,:,3) = 1 2 3
           1 2 3
           1 2 3

then

y(:,:,1) = 1 0 0
           4 5 0
           7 8 9
y(:,:,2) = 1 0 0
           2 5 0
           3 6 9
y(:,:,3) = 1 0 0
           1 2 0
           1 2 3

Problem Group

12 solvers submitted 16 solutions (1.33 solutions/solver).

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