Times Method

Returns a new matrix object that represents the result of the multiplication of the current matrix by another matrix.

Syntax

MatrixObject.Times(Matrix2)

Return Value

A matrix object reference that contains the result of matrix multiplication.

Parameters

Matrix2: The matrix by which you will multiply the current matrix.

Remarks

The number or rows of Matrix2 parameter must be equal to number of columns of current matrix.

Error Codes

Error 1307 is returned if the number of rows of the Matrix2 is not equal to number of columns of the current matrix.

Example

This example demonstrates the use of the Times and Inverse methods. One matrix is created and then multiplied by its inverse to return the unitary matrix.

Private Sub MatrixInverse()

Dim A As Matrix, B As Matrix, C As Matrix

    'Generate a matrix, fill it with random values
    'and print it in debug window
    Set A = New Matrix
    A.Size 5, 5
    A.FillRandom
    Debug.Print "Matrix A = "
    Debug.Print A.GetString
    
    'Use Inverse method to get its inverse
    On Error Resume Next
    Set B = A.Inverse
    If (Err.Number = (vbObjectError + 1306)) Then
        Debug.Print "Matrix is singular"
        Exit Sub
    End If
    On Error GoTo 0
    Debug.Print "Matrix B = A.Inverse"
    Debug.Print B.GetString
    
    'Now verify the result by forming the product
    ' C = A x B. Matrix C is a unary matrix
    Set C = A.Times(B)
    Debug.Print "C = A x B "
    Debug.Print C.GetString
    
End Sub

Output

Matrix A = 
|  6.000  2.000  8.000  6.000  5.000 |
|  4.000  9.000  8.000  7.000  2.000 |
|  9.000  7.000  5.000  3.000  0.000 |
|  1.000  4.000  1.000  2.000 10.000 |
|  4.000  1.000  0.000  0.000  4.000 |

Matrix B = A.Inverse
| -0.048  0.176 -0.158 -0.235  0.560 |
| -0.076 -0.069  0.198  0.174 -0.305 |
|  0.410 -1.035  1.032  0.847 -2.112 |
| -0.362  1.360 -1.374 -1.112  2.552 |
|  0.067 -0.158  0.108  0.192 -0.233 |

C = A x B 
| 1.000 0.000 0.000 0.000 0.000 |
| 0.000 1.000 0.000 0.000 0.000 |
| 0.000 0.000 1.000 0.000 0.000 |
| 0.000 0.000 0.000 1.000 0.000 |
| 0.000 0.000 0.000 0.000 1.000 |