Home | Sign in | English  Help WLanguage WLanguage functions Standard functions Functions for managing numeric values Matrix functions MatMultiply Presentation Example Multiplying matrices Existence of the result matrix Related examples See also  Functions for managing matrices MatAdd MatCopy MatCreate MatDelete MatDeterminant MatError MatExist MatFill MatFloatAdd MatFloatMultiply MatInvert MatMultiply MatNbColumn MatNbLine MatRead MatReadColumn MatReadLine MatStack MatTranspose MatWrite The matrices
• Multiplying matrices
• Existence of the result matrix
WINDEV      WEBDEV    WINDEV Mobile      Others MatMultiply (Function)
In french: MatMultiplie
Multiplies two matrices.  Versions 15 and later This function is now available for Android applications. New in version 15 This function is now available for Android applications. This function is now available for Android applications. Versions 17 and later This function is now available for iPhone/iPad applications. New in version 17 This function is now available for iPhone/iPad applications. This function is now available for iPhone/iPad applications. Versions 18 and later This function is now available in Android Widget mode. This function is now available in Windows Store apps mode. New in version 18 This function is now available in Android Widget mode. This function is now available in Windows Store apps mode. This function is now available in Android Widget mode. This function is now available in Windows Store apps mode. Versions 21 and later This function is now available in Universal Windows 10 App mode. New in version 21 This function is now available in Universal Windows 10 App mode. This function is now available in Universal Windows 10 App mode.
// Multiply two matrices
ResMultiply = MatMultiply("Matrix1", "Matrix2", "MyResultMatrix")
Syntax
<Result> = MatMultiply(<Name of 1st Matrix> , <Name of 2nd Matrix> , <Name of Result Matrix>)
<Result>: Boolean
• True if the multiplication was performed,
• False otherwise. To find out the error details, use ErrorInfo associated with the errMessage constant.
<Name of 1st Matrix>: Character string (with quotes)
Name of first matrix to multiply, defined by MatCreate.
<Name of 2nd Matrix>: Character string (with quotes)
Name of second matrix to multiply, defined by MatCreate.
<Name of Result Matrix>: Character string (with quotes)
Name of the matrix that contains the result of the multiplication. This matrix is automatically created when the two matrices are multiplied.
Remarks

Multiplying matrices

To multiply two matrices, the number of columns in the first matrix must be equal to the number of rows in the second matrix.
The element (row I, column j) of the result matrix is obtained by multiplying the row I of the first matrix by the column j of the second matrix.
A matrix can be multiplied by itself. To do so, use the same matrix name for <Name of 1st Matrix> and <Name of 2nd Matrix>.

Existence of the result matrix

The matrix existence is not checked. This matrix is overwritten if it existed beforehand. To check the matrix existence, use MatExist.
Related Examples: Unit examples (WINDEV): The Matrix functions [ + ] Using matrices with the WLanguage functions.This example, powered by WINDEV, is used to perform calculations on matrices: addition, multiplication, transposition, inversion... Unit examples (WINDEV Mobile): The Matrix functions [ + ] Using matrices with the WLanguage functions: addition, multiplication, transposition, inversion...
Component : wd240mat.dll
Minimum version required
• Version 9