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Question: Bug in shape=triangular[upper/lower, unit]

Question:Bug in shape=triangular[upper/lower, unit]

Mbert 50 Maple
linearalgebra
February 23 2019
4

Hello,

in Maple 2017 (could not try 2018) the following is a bug;
 

with(LinearAlgebra);
U:= Matrix(4,4, shape=triangular[upper, unit], symbol =u);
-U;

 

It returns the wrong matrix, with +1 on the diagonal and -u_{ij} on the upper part. That is, it changes the sign only of the entries in the upper part. The bug is for any size, and also for lower triangular.

 
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