matrixMultiply: Difference between revisions
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|gr2= Math - Vectors | |gr2= Math - Vectors | ||
|descr= Returns resulting matrix from the {{Wikipedia|Matrix_multiplication|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 | |descr= Returns resulting matrix from the {{Wikipedia|Matrix_multiplication|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 {{hl|columns}} matrix1 <nowiki>==</nowiki> {{hl|rows}} matrix2. The resulting matrix will be of the size n ✕ m. If the shapes do not match, empty array [] will be returned.<br><br> | ||
[[Image:matrixMultiply.jpg|600px]] | [[Image:matrixMultiply.jpg|600px]] | ||
|s1= matrix1 [[matrixMultiply]] matrix2 | |s1= matrix1 [[matrixMultiply]] matrix2 | ||
|p1=matrix1: [[Array]] - matrix of the size | |p1=matrix1: [[Array]] - matrix of the size {{hl|n}}''(rows)'' ✕ {{hl|k}}''(columns)'' | ||
|p2=matrix2: [[Array]] - matrix of the size | |p2=matrix2: [[Array]] - matrix of the size {{hl|k}}''(rows)'' ✕ {{hl|m}}''(columns)'' | ||
|r1= [[Array]] - resulting matrix of the size | |r1= [[Array]] - resulting matrix of the size {{hl|n}}''(rows)'' ✕ {{hl|m}}''(columns)'' | ||
|x1= <code>[ | |x1= <code>[ | ||
Revision as of 23:44, 15 November 2021
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.
- Groups:
- MathMath - Vectors
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:
- matrixTransposevectorAddvectorMagnitudevectorNormalizedvectorMultiplyvectorDotProductvectorCrossProductvectorDistancevectorLinearConversionvectorCosvectorFromTovectorModelToWorldvectorWorldToModelBIS_fnc_transformVectorDirAndUp
Notes
-
Report bugs on the Feedback Tracker and/or discuss them on the Arma Discord or on the Forums.
Only post proven facts here! Add Note
- 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]]