How can I make a matrix from an array

[hollandamsterdam]

Hi,

Can anyone tell me how to make a matrix from an array?
My problem is the following:
My data looks like:
X1 X2 X3 X4
1 2% 3% 4%
2 1% 4% 8%
3 9% 2% 3%
..
40 1% 2% 1%

So my array looks like: array(1 to 40, 1 to 3)
Where array(2,1) = 1%, array(2,2) = 4%, array(2,3) = 8%
Now how can I make a matrix of this??
So how can I create the following:
matrix(1)=(2%,3%,4%)
matrix(2)=(1%,4%,8%)
and so on

Now I want to be able to create the following matrix in VBA:
matrixnew = application.Mmult(matrix(2), application.Transpose(matrix(1)))
Thats my goal!

So if anyone could help me out please??? I would really be greatfull for ANY help, because I have been looking for hours for a sollution, but i am not getting there..

Thanks for your help!

Greetings,

Pascal.

 

[jim may]

set it up as follows:

For i = 1 to 40
For j = 1 to 3
myarr(i, j) = cells(i, j)
Next j
Next i

 

[mikerickson]

Dim myArray As Variant, mySecondArray As Variant

myArray = Range("A1:C40").Value

mySecondArray = Application.MMult(myArray, Application.Transpose(myArray))

 

[hollandamsterdam]

Hi guys,

Thank you very much for your help. But I am not there yet: an array(1 to 40, 1 to 3) I already have. Now I need to make matrices from this array.

So if the data is: Range("A1:D40") I need to be able to refer to the following matrices:
Matrix(1)=Range("B1:D1")
Matrix(2)=Range("B2:D2")
...
Matrix(40)=Range("B40:D40")

Once I have this, the matrix multiplication is no problem.


Hope you got an answer?!

Greetings,

Pascal.

 

[mikerickson]

Dim Matrix(1 to 40) as Variant
Dim i As Long
For i = 0 to 39
    Matrix(i+1)=Range("B1:D1").Offset(i,0).Value
Next

 

[hollandamsterdam]

Thanks for your help,

But I am not there yet..

This is my code:
Range("A4:D40").Select
datamatrix = Selection
datamatrix (1)
datamatrix (2)
...

Is there not a short way for it that to say like:
matrix(1) = (datamatrix(1,2),datamatrix(1,3),datamatrix(1,4))
matrix(2) = (datamatrix(2,2),datamatrix(2,3),datamatrix(2,4))


Greetings,

Pascal.

 

[pgc01]

Hi Pascal

You can use the worksheet function Index().

Example:

Sub Test()
Dim datamatrix, matrixnew
 
datamatrix = Range("B2:D41").Value
 
' Your post: matrixnew = application.Mmult(matrix(2), application.Transpose(matrix(1)))
 
With Application.WorksheetFunction
    matrixnew = .MMult(.Index(datamatrix, 2, 0), .Transpose(.Index(datamatrix, 1, 0)))
End With
 
End Sub

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PADDING-RIGHT: 0.5em; PADDING-LEFT: 0.5em; BORDER-LEFT-WIDTH: 1px; BORDER-LEFT-COLOR: #000000; BACKGROUND: #9cf; BORDER-BOTTOM-WIDTH: 1px; BORDER-BOTTOM-COLOR: #000000; PADDING-BOTTOM: 0.25em; BORDER-TOP-COLOR: #000000; PADDING-TOP: 0.4em; TEXT-ALIGN: center; BORDER-RIGHT-WIDTH: 1px; BORDER-RIGHT-COLOR: #000000">5</TD><TD style="BORDER-TOP-WIDTH: 1px; PADDING-RIGHT: 0.5em; PADDING-LEFT: 0.5em; BORDER-LEFT-WIDTH: 1px; BORDER-LEFT-COLOR: #888888; BORDER-BOTTOM-WIDTH: 1px; BORDER-BOTTOM-COLOR: #888888; PADDING-BOTTOM: 0.25em; BORDER-TOP-COLOR: #888888; PADDING-TOP: 0.4em; TEXT-ALIGN: center; BORDER-RIGHT-WIDTH: 1px; BORDER-RIGHT-COLOR: #888888">...</TD><TD style="BORDER-TOP-WIDTH: 1px; PADDING-RIGHT: 0.5em; PADDING-LEFT: 0.5em; BORDER-LEFT-WIDTH: 1px; BORDER-LEFT-COLOR: #888888; BORDER-BOTTOM-WIDTH: 1px; BORDER-BOTTOM-COLOR: #888888; PADDING-BOTTOM: 0.25em; BORDER-TOP-COLOR: #888888; PADDING-TOP: 0.4em; TEXT-ALIGN: center; BORDER-RIGHT-WIDTH: 1px; BORDER-RIGHT-COLOR: #888888">...</TD><TD style="BORDER-TOP-WIDTH: 1px; PADDING-RIGHT: 0.5em; PADDING-LEFT: 0.5em; BORDER-LEFT-WIDTH: 1px; BORDER-LEFT-COLOR: #888888; BORDER-BOTTOM-WIDTH: 1px; BORDER-BOTTOM-COLOR: #888888; PADDING-BOTTOM: 0.25em; BORDER-TOP-COLOR: #888888; PADDING-TOP: 0.4em; TEXT-ALIGN: center; BORDER-RIGHT-WIDTH: 1px; BORDER-RIGHT-COLOR: #888888">...</TD><TD style="BORDER-TOP-WIDTH: 1px; PADDING-RIGHT: 0.5em; PADDING-LEFT: 0.5em; BORDER-LEFT-WIDTH: 1px; BORDER-LEFT-COLOR: #888888; BORDER-BOTTOM-WIDTH: 1px; BORDER-BOTTOM-COLOR: #888888; PADDING-BOTTOM: 0.25em; BORDER-TOP-COLOR: #888888; PADDING-TOP: 0.4em; TEXT-ALIGN: center; BORDER-RIGHT-WIDTH: 1px; BORDER-RIGHT-COLOR: #888888">...</TD><TD style="BORDER-TOP-WIDTH: 1px; PADDING-RIGHT: 0.5em; PADDING-LEFT: 0.5em; BORDER-LEFT-WIDTH: 1px; BORDER-LEFT-COLOR: #888888; BORDER-BOTTOM-WIDTH: 1px; BORDER-BOTTOM-COLOR: #888888; PADDING-BOTTOM: 0.25em; BORDER-TOP-COLOR: #888888; PADDING-TOP: 0.4em; TEXT-ALIGN: right; BORDER-RIGHT-WIDTH: 1px; BORDER-RIGHT-COLOR: #888888"> </TD></TR><TR><TD style="PADDING-LEFT: 1em; BACKGROUND: #9cf" colSpan=6>[Book1]Sheet2</TD></TR></TBODY></TABLE>


P. S. You don't have, however, to read the values into an array if you don't want to. You can do the calculations referring directly to the values in the range.