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VBA - Loop through cells and multiply based on certain cells

Posted on 2016-10-21
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Last Modified: 2016-10-21
Need VBA to do the below calculations. The range however can be 100s of columns and 100s of row.                                     
So, I need to be able to loop through.                                     
                                    
  (A$1*A3)       (B$1*B3)       (C$1*C3)       etc.
 (A$1*A3)       (B$1*B3)       (C$1*C3)       etc.
 (A$1*A3)       (B$1*B3)       (C$1*C3)       etc.
 (A$1*A3)       (B$1*B3)       (C$1*C3)       etc.
 (A$1*A3)       (B$1*B3)       (C$1*C3)       etc.
 (A$1*A3)       (B$1*B3)       (C$1*C3)       etc.
 (A$1*A3)       (B$1*B3)       (C$1*C3)       etc.
 (A$1*A3)       (B$1*B3)       (C$1*C3)       etc.
 (A$1*A3)       (B$1*B3)       (C$1*C3)       etc.


I found the below code; however, I don't know what to do to get it to loop through the ranges and apply the formula based on row and column.

Sub LoopRange()

    Dim rCell As Range
    Dim rRng As Range

   
    ActiveSheet.Range("C16:C25").Select

    For Each rCell In Selection
       If Not IsError(rCell) Then rCell = rCell * "don't now what to do here"
    Next rCell

End Sub
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Question by:MATO0618
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LVL 45

Expert Comment

by:aikimark
ID: 41854491
Not quite sure what you need.  Your 'formulas' all point to the same row pars, even though they are on many rows.
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Author Comment

by:MATO0618
ID: 41854503
I see the mistake I made.  It shouldn't have been the same pars.

 (A$1*A3)       (B$1*B3)       (C$1*C3)       etc.
 (A$1*A4)       (B$1*B4)       (C$1*C4)       etc.
 (A$1*A5)       (B$1*B5)       (C$1*C5)       etc.
 (A$1*A6)       (B$1*B6)       (C$1*C6)       etc.
 (A$1*A7)       (B$1*B7)       (C$1*C7)       etc.
 (A$1*A8)       (B$1*B8)       (C$1*C8)       etc.
 (A$1*A9)       (B$1*B9)       (C$1*C9)       etc.
 (A$1*A10)       (B$1*B10)       (C$1*C10)       etc.
 (A$1*A11)       (B$1*B11)       (C$1*C11)       etc.
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LVL 45

Expert Comment

by:aikimark
ID: 41854592
Do you want the formulas or just the values?
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LVL 45

Expert Comment

by:aikimark
ID: 41854602
This would populate the A16:K25 cells.
activesheet.range("A16").formula="=A$1*A3"
activesheet.range("A16:A25").filldown
activesheet.range("A16:K25").fillright

Open in new window


It would be easy enough to convert them from formulas to values.
activesheet.range("A16:K25").value = activesheet.range("A16:K25").value

Open in new window

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Expert Comment

by:aikimark
ID: 41854604
I don't really see the need for looping
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Author Comment

by:MATO0618
ID: 41854739
i didn't explain it clearly. So, hopefully this try at an explanation is better.

I've attached a worksheet where you can see original and what I eventually need to happen.

NOTE: The range of course would be much larger than this example.

I created a crude macro, but this would be very cumbersome if I had to do it that way.
Multiple-with-VBA-across-Range.xlsm
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LVL 45

Expert Comment

by:aikimark
ID: 41854768
Try this:
1. Select the first/top row of cells
2. Ctrl+C
3. Select all the cells below the top row
4. Paste Special (Values, Multiply)

Let me know if that gives you the values you want.
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LVL 45

Accepted Solution

by:
aikimark earned 500 total points
ID: 41854770
If that works, this is the automated equivalent.
Sub Q_28978063()
    Dim rng As Range
    Set rng = ActiveSheet.Range("C1:H1")
    rng.Copy
    Set rng = rng.Offset(1)
    Set rng = ActiveSheet.Range(rng, rng.End(xlDown))
    rng.PasteSpecial xlPasteValues, xlPasteSpecialOperationMultiply
End Sub

Open in new window

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Author Comment

by:MATO0618
ID: 41854780
I tried the automated equivalent and it works partially. But, the difference is that the first row values are absolute values.

So the output is not correct in this solution.
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LVL 45

Expert Comment

by:aikimark
ID: 41854782
the first row values are absolute values
What does that mean?

Was your posted workbook a representative example of the data?
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Author Comment

by:MATO0618
ID: 41854786
Yes it was a representative example of the data.

All values are multiplied by the first row. In the last solution, the past copy moves it down, and thereby the next row would multiply by the second row and so forth.

Range("C2").Value = Evaluate("C2*$C$1")
Range("D2").Value = Evaluate("D2*$D$1")
Range("E2").Value = Evaluate("E2*$E$1")
Range("F2").Value = Evaluate("F2*$F$1")
Range("G2").Value = Evaluate("G2*$G$1")
Range("H2").Value = Evaluate("H2*$H$1")

Range("C3").Value = Evaluate("C3*$C$1")
Range("D3").Value = Evaluate("D3*$D$1")
Range("E3").Value = Evaluate("E3*$E$1")
Range("F3").Value = Evaluate("F3*$F$1")
Range("G3").Value = Evaluate("G3*$G$1")
Range("H3").Value = Evaluate("H3*$H$1")
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LVL 45

Expert Comment

by:aikimark
ID: 41854788
when I tested the code, it gave the same values as you posted in your posted workbook.
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Author Closing Comment

by:MATO0618
ID: 41854791
Yeah...... you're correct. I had inadvertently wasn't using apples to apples when I tested on the original data.

Thanks for your help.
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