matrixMultiply

Description

Returns resulting matrix from the multiplication of two matrices. First matrix must be of the size n × k, while the second must be of the size k × m, i.e columns matrix1 == rows matrix2. The resulting matrix will be of the size n × m. If the shapes do not match, empty array [] will be returned.

Syntax

matrix1 matrixMultiply matrix2

Parameters:

• matrix1: Array of Array of Numbers - matrix of the size n(rows) × k(columns)
• matrix2: Array of Array of Numbers - matrix of the size k(rows) × m(columns)

Returns: Array of Array of Numbers - resulting matrix of the size n(rows) × m(columns)

Examples

Example 1

[
    [2],
    [2]
] 
matrixMultiply 
[
    [3] 
]
/* returns 
[
    [6],
    [6]
] */

Example 2

[
    [-1,0,0],
    [0,-1,0]
] 
matrixMultiply 
[
    [1,2],
    [3,1],
    [2,3]
] 
/* returns 
[
    [-1,-2],
    [-3,-1]
] */

See also

matrixTranspose · vectorAdd · vectorMagnitude · vectorNormalized · vectorMultiply · vectorDotProduct · vectorCrossProduct · vectorDistance · vectorLinearConversion · vectorCos · vectorFromTo · vectorModelToWorld · vectorWorldToModel · BIS_fnc_transformVectorDirAndUp

[[-1,0,0],[0,-1,0],[0,0,-1]] matrixMultiply [1,2,3] // wrong, syntax error
[[-1,0,0],[0,-1,0],[0,0,-1]] matrixMultiply [[1,2,3]] // wrong, will return []
[[-1,0,0],[0,-1,0],[0,0,-1]] matrixMultiply [[1], [2], [3]] // correct, will return [[-1], [-2], [-3]]