matrixMultiply

1.92

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Description

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.

Multiplayer:

-

Groups:

Uncategorised

Syntax

Syntax:

matrix1 matrixMultiply matrix2

Parameters:

matrix1: Array - matrix of the size n(rows) ✕ k(columns)

matrix2: Array - matrix of the size k(rows) ✕ m(columns)

Return Value:

Array - 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] ] */

Additional Information

See also:

matrixTranspose

Notes

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Posted on 30 Jun, 2019

oOKexOo

Note that this command won't transform a 1D array automatically into a column vector [[-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]]