<lower-matrix> ( object m n -- matrix )
Matrix operations

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Vocabulary
math.matrices

Inputs

object	an object
m	an integer
n	an integer

Outputs

matrix

a matrix

Word description
Make a lower triangular matrix, where all the values above the main diagonal are 0. object will be used as the value for the nonzero part of the matrix, while m and n are used as the dimensions. The inverse of this word is <upper-matrix>. See triangular matrix.

Examples

USING: math.matrices prettyprint ; 1 5 5 <lower-matrix> .
{ { 1 0 0 0 0 } { 1 1 0 0 0 } { 1 1 1 0 0 } { 1 1 1 1 0 } { 1 1 1 1 1 } }

Definition

USING: kernel math.matrices.private ;

IN: math.matrices

: <lower-matrix> ( object m n -- matrix )
    <zero-matrix>
    [ lower-matrix-indices ] [ matrix-set-nths ] [ ] tri ;