Matrix Multiplication In Excel For Mac
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I am trying to program some matrix algebra functions in Excel. I managed to program the product of two matrices, with a function. When I call the function in another function, it does not work THe following is the matrix product function. You have to enter two matrices (A,B), for example cells A1:B1 & C1:D2, and if you paste the function in area E1:F2 you get the matrix product. Function MATPROD(A, B) Dim Na As Integer Dim Ma As Integer Dim Nb As Integer Dim Mb As Integer Na = A.Rows.Count Ma = A.Columns.Count Nb = B.Rows.Count Mb = B.Columns.Count Dim c() As Double ReDim c(1 To Na, 1 To Mb) Dim i As Integer Dim j As Integer Dim k As Integer Dim Sumxy As Double For i = 1 To Na For j = 1 To Mb Sumxy = 0 For k = 1 To Nb Sumxy = Sumxy + A.Cells(i, k).Value * B.Cells(k, j).Value Next k c(i, j) = Sumxy Next j Next i MATPROD = c End Function When I try to use this function in another function, nothing works. Just try the following Function Matt(A,B,C) D = matrprod(B,C) Matt = matrprod(A,D) End FUnction I get error messages. CAn anyone explain me what is the error?
Thnaks a lot Claudio. This may be your problem. A function called from a cell within a worksheet may not affect any values or formatting of any cell other than its own. This is to allow Excel to recalculate your worksheet properly.
Its recalculation algorithm would get entirely mixed up if Excel allowed functions called from worksheets to affect cells other than the cell from which the function was called. So that is a major limitation of functions called from worksheets as compared with a function or subroutine that is invoked through other means. In other words, the very same function called from a worksheet cell behaves differently when it is called through some other means--the restriction I mentioned above does NOT apply when called through some other means. And of course this limitation also applies to functions or subroutines called from functions that are invoked from worksheets.
So perhaps this is your problem. Make sure that all of your functions that you intend to call from within worksheet cells (again, as opposed to being invoked through some other means) do not assume they can affect any cells other than their calling cells. Claudio, Do you know about the built-in functions?
MPROD will take you a ways, and is much faster than what you wrote. If you know some French, also check out What you wrote is set up fine for returning results to a worksheet (Ctrl-Shift-Enter the formula) or whatever, but you are getting messed up by your data typing in Matt. On the first call (I corrected your spelling) D is an array of doubles, so when you call Matt = matprod(A,D) the function MATPROD crashes, because the *variant* D which you coerced to type Doubles() doesn't have.Cells and the other properties you assumed. So if you insisit on going this route, think about typing the arguments/parameters carefully. HTH Dave Braden.