UPTRIX

Purpose:

Returns the upper triangle of a matrix, excluding the main diagonal

UPTRIX(a)

A matrix.

An array of size(a) consisting of the upper triangle of a, excluding the main diagonal, with the other elements set to 0.

W1: ones(3)

W2: uptrix(W1)

W2 == {{0, 1, 1},

{0, 0, 1},

{0, 0, 0}}

UPTRIX excludes the main diagonal. Use UPTRI to include the main diagonal.

Use TRIU to return the upper matrix above a specified diagonal.