Hello,
We are developping an application with matrix using VB6 SP4.
We use "Component Works 2.0.1" of National Instrument in order to use matrix functions.
So, in a Form we have added the component CWMatrix (rename CWMatrix1). We use it to make some operations :
- Multiplications : CWMatrix.MatrixMul(x)
- Inversion : CWMatrix.InvMatrix(x)
We have been able to use without any problem the multiplication function and we get the good results.
However we can't use correctly the inversion function because whatever is the input matrix, an error message tell us
that the matrix is singular and can't be reversed, whereas we put an input matrix which can be reversed.
We have tryed to use the function CWMatrix.Determinant(x) to calculate
the determinant but whatever is the matrix, the result is always 0.
We can see a part of our code :
'Matrix Déclaration in the top of the Form
Private MatricePassageGlobale() As Double 'Matrice de passage globale
Private MatricePassage2() As Double 'Matrice de passage
Private MatricePassage3() As Double 'Matrice de passage
'Matrix redimensioning
ReDim MatricePassageGlobale(3, 3)
ReDim MatricePassage2(3, 3)
ReDim MatricePassage3(3, 3)
'Code
MatricePassage2(1, 1) = 1
MatricePassage2(2, 2) = 1
MatricePassage2(3, 3) = 1
MatricePassage3(1, 1) = 2
MatricePassage3(2, 2) = 2
MatricePassage3(3, 3) = 2
MatricePassageGlobale = CWMatrix1.MatrixMul(MatricePassage2, MatricePassage3)
'Results checking
MsgBox "1,1= " & MatricePassageGlobale(1, 1)
MsgBox "1,2= " & MatricePassageGlobale(1, 2)
MsgBox "1,3= " & MatricePassageGlobale(1, 3)
MsgBox "2,1= " & MatricePassageGlobale(2, 1)
MsgBox "2,2= " & MatricePassageGlobale(2, 2)
MsgBox "2,3= " & MatricePassageGlobale(2, 3)
MsgBox "3,1= " & MatricePassageGlobale(3, 1)
MsgBox "3,2= " & MatricePassageGlobale(3, 2)
MsgBox "3,3= " & MatricePassageGlobale(3, 3)
'Determinant display
MsgBox "det = " & CWMatrix1.Determinant(MatricePassageGlobale)
'Matrix inversion
MatricePassageGlobale = CWMatrix1.InvMatrix(MatricePassageGlobale)
On the line of the inversion, an error message occured :
Erreur d'exécution '20041'
The Syteme of equations cannot be solved because the input matrix is singular
Could you help us to solve this problem please ?
Thank a lot if you have read our message and if you can answer
Julien
