LOTRI

Purpose:

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

Syntax:

LOTRI(a)

a

-

A matrix.

Returns:

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

Example:

W1: ones(3)

W2: lotri(W1)

 

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

       {1, 1, 0}, 

       {1, 1, 1}} 

Remarks:

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

 

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

See Also:

COLNOS

LOTRIX

ROWNOS

TRIL

UPTRI

UPTRIX