LOTRI

Purpose:

Returns the lower triangle of a matrix, including the main diagonal.

LOTRI(a)

A matrix.

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

W1: ones(3)

W2: lotri(W1)

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

{1, 1, 0},

{1, 1, 1}}

LOTRI includes the main diagonal. Use LOTRIX to exclude the main diagonal.

See TRIL to return the lower matrix below a specified diagonal.