Problem 43011. Convert a vector to a lower triangular matrix

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I now have a row vector and I want to convert it to a lower trilangular matrix.
The rows of the lower trilangular matrix have the corresponding elements of the vector.
For example:
input = 1:16
output = [
   1     0     0     0     0     0
   2     3     0     0     0     0
   4     5     6     0     0     0
   7     8     9    10     0     0
  11    12    13    14    15     0
  16     0     0     0     0     0]

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Last Solution submitted on Jul 28, 2026

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