我目前正在开展一项工作，我必须建立一个能够用Cramer规则解决的程序。但是，似乎我需要构建两个基本矩阵：matA和matB不能因为索引超出范围而我真的看不到哪里。这是代码：
Public Class Form1
Dim matA(2, 2) As Double
Dim matB(2, 0) As Double
Dim matC(2, 2) As Double
Dim matResultat(0, 2) As Double
Dim deltaX, deltaY, deltaZ, delta As Double
Public Function det(ByVal A As Double(,)) As Double
Dim determinant As Double
determinant = 0
For i As Integer = 0 To A.GetUpperBound(0)
If i = 1 Then
determinant -= A(0, i) * (A(1, 0) * A(2, 2) - A(2, 0) * A(1, 2))
ElseIf i = 0 Then
determinant += A(0, i) * (A(1, 1) * A(2, 2) - A(2, 1) * A(1, 2))
Else
determinant += A(0, i) * (A(1, 0) * A(2, 1) - A(2, 0) * A(1, 1))
End If
Next
Return determinant
End Function
Public Function solve(ByVal A As Double(,), ByVal B As Double(,)) As Double(,)
Dim resultat(0, 2) As Double
matC = A
For i As Integer = 0 To 2
For j As Integer = 0 To 2
matC(j, i) = B(j, i)
Next
resultat(0, i) = det(matC)
matC = A
Next
Return resultat
End Function
Private Sub ButtonSolve_Click(sender As Object, e As EventArgs) Handles ButtonSolve.Click
Try
matA(0, 0) = TBX1.Text
matA(0, 1) = TBY1.Text
matA(0, 2) = TBZ1.Text
matA(1, 0) = TBX2.Text
matA(1, 1) = TBY2.Text
matA(1, 2) = TBZ2.Text
matA(2, 0) = TBX3.Text
matA(2, 1) = TBY3.Text
matA(2, 2) = TBZ3.Text
matB(0, 0) = TBR1.Text
matB(0, 1) = TBR2.Text
matB(0, 2) = TBR3.Text
Catch ex As Exception
MessageBox.Show(ex.Message)
MessageBox.Show("Vous devez remplir chaque case avec un nombre entier ou à virgule.")
Exit Sub
End Try
matResultat = solve(matA, matB)
deltaX = matResultat(0, 0)
deltaY = matResultat(0, 1)
deltaZ = matResultat(0, 2)
delta = det(matA)
If delta = 0 Then
MessageBox.Show("Le SEL admet une infinité ou aucune solution.")
Else
MessageBox.Show("Le SEL admet une solution unique." & vbCrLf & "X: " & deltaX / delta & vbCrLf & "Y: " & deltaY / delta & vbCrLf & "Z: " & deltaZ / delta)
End If
End Sub
End Class