matrix multiplication

[vbwire]

this program have 3 arrays.. x,y and z.. its multiply array x and array y and will display the answer in array z.. my problem is, how to make the answer displays at z?

[CODE=vb]
Private Sub Command1_Click( )

Dim X(1 To 3, 1 To 3) As Integer
Dim Y(1 To 3, 1 To 3) As Integer
Dim Z(1 To 3, 1 To 3) As Integer
Dim row As Integer
Dim col As Integer


For row = 1 To 3
For col = 1 To 3
Z(row, col) = (X(row, 1) * Y(1, col)) + (X(row, 2) * Y(2, col)) + (X(row, 3) * Y(3, col))

Next
Next

txtZ(0 to 8)=Z(row, col)

End Sub [/CODE]

[QVeen72]

Hi,

To Display the Result also, you need to loop through:

Check This :

[CODE=vb]
Private Sub Command1_Click( )

Dim X(1 To 3, 1 To 3) As Integer
Dim Y(1 To 3, 1 To 3) As Integer
Dim Z(1 To 3, 1 To 3) As Integer
Dim row As Integer
Dim col As Integer
dim k As Integer
k=0
For row = 1 To 3
For col = 1 To 3
Z(row, col) = (X(row, 1) * Y(1, col)) + (X(row, 2) * Y(2, col)) + (X(row, 3) * Y(3, col))
txtZ(k)=Z(row, col)
k = k + 1
Next
Next

End Sub [/CODE]

Regards
Veena

[vbwire]

A(1, 1) = txtA(0).Text
A(1, 2) = txtA(1).Text
A(1, 3) = txtA(2).Text
A(2, 1) = txtA(3).Text
A(2, 2) = txtA(4).Text
A(2, 3) = txtA(5).Text
A(3, 1) = txtA(6).Text
A(3, 2) = txtA(7).Text
A(3, 3) = txtA(8).Text

B(1, 1) = txtB(0).Text
B(1, 2) = txtB(1).Text
B(1, 3) = txtB(2).Text
B(2, 1) = txtB(3).Text
B(2, 2) = txtB(4).Text
B(2, 3) = txtB(5).Text
B(3, 1) = txtB(6).Text
B(3, 2) = txtB(7).Text
B(3, 3) = txtB(8).Text

is there any other way to load the value from the matrix? i use visual basic 6.0

[Killer42]

I'm sure we can come up with much more compact (and possibly efficient) ways of doing this, using loops. But I'm short on time right now so I'll just say this...

If you are trying to place the results into the textboxes, then the statements coded in post #3 are backwards.

Also, I think line 12 in the original code posted in message #1 is probably wrong, but we can discuss that.

[QVeen72]

Hi,

Try This :


[CODE=vb]
Dim i As Integer
Dim j As Integer
Dim k As Integer
k= -1
For i= 1 To 3
For j = 1 To 3
k = k + 1
A(i , j) = txtA(k).Text
B(i , j) = txtB(k).Text
Next j
Next i
[/CODE]

Regards
Veena

[vbwire]

this is what i programmed..

Private Sub cmdExit_Click()
Unload Me
End Sub

Private Sub cmdXy_Click()

Dim A(1 To 6, 1 To 6) As Integer
Dim x(1 To 6, 1 To 4) As Integer
Dim y(1 To 4, 1 To 6) As Integer
Dim z(1 To 4, 1 To 6) As Integer
Dim row As Integer
Dim col As Integer


x(1, 1) = txtX(0).Text
x(1, 2) = txtX(1).Text
x(1, 3) = txtX(2).Text
x(1, 4) = txtX(3).Text
x(2, 1) = txtX(4).Text
x(2, 2) = txtX(5).Text
x(2, 3) = txtX(6).Text
x(2, 4) = txtX(7).Text
x(3, 1) = txtX(8).Text
x(3, 2) = txtX(9).Text
x(3, 3) = txtX(10).Text
x(3, 4) = txtX(11).Text
x(4, 1) = txtX(12).Text
x(4, 2) = txtX(13).Text
x(4, 3) = txtX(14).Text
x(4, 4) = txtX(15).Text
x(5, 1) = txtX(16).Text
x(5, 2) = txtX(17).Text
x(5, 3) = txtX(18).Text
x(5, 4) = txtX(19).Text
x(6, 1) = txtX(20).Text
x(6, 2) = txtX(21).Text
x(6, 3) = txtX(22).Text
x(6, 4) = txtX(23).Text

y(1, 1) = txtY(0).Text
y(1, 2) = txtY(1).Text
y(1, 3) = txtY(2).Text
y(1, 4) = txtY(3).Text
y(1, 5) = txtY(4).Text
y(1, 6) = txtY(5).Text
y(2, 1) = txtY(6).Text
y(2, 2) = txtY(7).Text
y(2, 3) = txtY(8).Text
y(2, 4) = txtY(9).Text
y(2, 5) = txtY(10).Text
y(2, 6) = txtY(11).Text
y(3, 1) = txtY(12).Text
y(3, 2) = txtY(13).Text
y(3, 3) = txtY(14).Text
y(3, 4) = txtY(15).Text
y(3, 5) = txtY(16).Text
y(3, 6) = txtY(17).Text
y(4, 1) = txtY(18).Text
y(4, 2) = txtY(19).Text
y(4, 3) = txtY(20).Text
y(4, 4) = txtY(21).Text
y(4, 5) = txtY(22).Text
y(4, 6) = txtY(23).Text

z(1, 1) = txtZ(0).Text
z(1, 2) = txtZ(1).Text
z(1, 3) = txtZ(2).Text
z(1, 4) = txtZ(3).Text
z(1, 5) = txtZ(4).Text
z(1, 6) = txtZ(5).Text
z(2, 1) = txtZ(6).Text
z(2, 2) = txtZ(7).Text
z(2, 3) = txtZ(8).Text
z(2, 4) = txtZ(9).Text
z(2, 5) = txtZ(10).Text
z(2, 6) = txtZ(11).Text
z(3, 1) = txtZ(12).Text
z(3, 2) = txtZ(13).Text
z(3, 3) = txtZ(14).Text
z(3, 4) = txtZ(15).Text
z(3, 5) = txtZ(16).Text
z(3, 6) = txtZ(17).Text
z(4, 1) = txtZ(18).Text
z(4, 2) = txtZ(19).Text
z(4, 3) = txtZ(20).Text
z(4, 4) = txtZ(21).Text
z(4, 5) = txtZ(22).Text
z(4, 6) = txtZ(23).Text



If optXy.Value = True Then
    For row = 1 To 6
        For col = 1 To 6
            A(row, col) = (x(row, 1) * y(1, col)) + (x(row, 2) * y(2, col)) + (x(row, 3) * y(3, col)) + (x(row, 4) * y(4, col))
        Next
    Next
Else
    For row = 1 To 6
        For col = 1 To 6
            A(row, col) = (x(row, 1) * z(1, col)) + (x(row, 2) * z(2, col)) + (x(row, 3) * z(3, col)) + (x(row, 4) * z(4, col))
        Next
    Next
End If




lbl11.Caption = A(1, 1)
lbl12.Caption = A(1, 2)
lbl13.Caption = A(1, 3)
lbl14.Caption = A(1, 4)
lbl15.Caption = A(1, 5)
lbl16.Caption = A(1, 6)
lbl21.Caption = A(2, 1)
lbl22.Caption = A(2, 2)
lbl23.Caption = A(2, 3)
lbl24.Caption = A(2, 4)
lbl25.Caption = A(2, 5)
lbl26.Caption = A(2, 6)
lbl31.Caption = A(3, 1)
lbl32.Caption = A(3, 2)
lbl33.Caption = A(3, 3)
lbl34.Caption = A(3, 4)
lbl35.Caption = A(3, 5)
lbl36.Caption = A(3, 6)
lbl41.Caption = A(4, 1)
lbl42.Caption = A(4, 2)
lbl43.Caption = A(4, 3)
lbl44.Caption = A(4, 4)
lbl45.Caption = A(4, 5)
lbl46.Caption = A(4, 6)
lbl51.Caption = A(5, 1)
lbl52.Caption = A(5, 2)
lbl53.Caption = A(5, 3)
lbl54.Caption = A(5, 4)
lbl55.Caption = A(5, 5)
lbl56.Caption = A(5, 6)
lbl61.Caption = A(6, 1)
lbl62.Caption = A(6, 2)
lbl63.Caption = A(6, 3)
lbl64.Caption = A(6, 4)
lbl65.Caption = A(6, 5)
lbl66.Caption = A(6, 6)



End Sub

[Killer42]

Populating the arrays can be coded in a much more compact way using loops. For instance...

[CODE=vb]
Private Sub cmdXy_Click()

Dim A(1 To 6, 1 To 6) As Long
Dim x(1 To 6, 1 To 4) As Long
Dim y(1 To 4, 1 To 6) As Long
Dim z(1 To 4, 1 To 6) As Long
Dim row As Long
Dim col As Long
Dim Pointer As Long

For row = 1 To 6
For col = 1 To 4
x(row, col) = txtX(Pointer).T ext
Pointer = Pointer + 1
Next
Next

Pointer = 0
For row = 1 To 4
For col = 1 To 6
y(row, col) = txtY(Pointer).T ext
z(row, col) = txtZ(Pointer).T ext
Pointer = Pointer + 1
Next
Next[/CODE]
I'm sure you could also combine these two sets of loops into a single one, but didn't have the time to play with it any more. In any case, one of the nice things about using loops like this is that if for example you decided to double the size of your array, the code hardly needs to be touched at all.

As for the actual calculation, I'm going to assume that your current code works. It could probably be rewritten to be a bit simpler by using another loop nested within row and col, which loops from 1 to 4. But it would run slower, and probably wouldn't be worth the effort.

Placing the results in the labels would also be much more compact if you make the labels into a control array. You can also "simulate" an array by building the control name dynamically. For example...
[CODE=vb]
For row = 1 To 6
For col = 1 To 6
Me.Control("lbl " & row & col).Caption = A(row, col)
Next
Next
[/CODE]


Of course, it's a matter of personal preference as to which way you want to code this stuff. You have to weigh up what's important to you. Various techniques will affect the length of the code, the complexity, performance, memory usage and so on.

[QVeen72]

Hi,

Use Killer's Code for Calculations and
Displaying of Results in Label can be done this way :

[code=vb]
Dim i As Integer
Dim j As Integer
Dim ctl As TextBox
Dim TStr As String
For i = 1 To 6
For j = 1 To 6
TStr = "lbl" & i & j
Set ctl = Me.Controls(TSt r)
ctl.Caption = A(i , j)
Next j
Next i
[/code]

Regards
Veena

[vbwire]

thank you.. i got it.. terima kasih..