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Grubeaters

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Sum Visible Columns or Rows in Range

I came across this user defined fuction on this site.  I would like to perhaps modify the below function to work like the SUM function.  For example, if my formula says =Sumvisible(E2, F2, H2, L2), it would add those cells that are visible.  If I hide Column F, then my formula should recalculate with E2, H2, and L2.  Is this possible or is there a better solution?

You can use user-defined function.
Press Alt-F11 (open VBA editor), add module and copy-paste next code:
Public Function SumVisible(a As Range) As Double
   Dim c As Range
   Dim value As Double
   value = 0
   
   For Each c In a
       If c.EntireColumn.Hidden = False And c.EntireRow.Hidden = False Then
           If IsNumeric(c.value) = True Then
               value = value + c.value
           End If
       End If
   Next
   SumVisible = value
End Function

after that on your sheet you can use this function:
=SumVisible("A1:D1")
=SumVisible("B1:B20")

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pauloaguia
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The function you posted already does just that.

The only thing I'm finding strange is that it doesn't recalculate when you hide a column. Not even if I press F9. Only when I change one of the values in the range or even the formula.

But asides from that the function is doing what you asked.

Paulo
If you have a filtered list (Data|Filter|Autofilter), then use the SUBTOTAL function #9. Otherwise the function above must be adapted. Please state whether the ranges G2 and I2:K2 contains numbers.
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Grubeaters

ASKER

The function that I posted will sum only visible columns or rows if they are consecutive.  For example, =sumvisible(A1:D1) sums cells A1, B1, C1 and D1 only if not hidden.  I want to have the function work on non-consecutive columns or rows so for example, =sumvisible(A1, D1, F1, Z1) would sum cells A1, D1, F1 and Z1 only if if they are not hidden.  

I forgot to add the appilaction.volatile so the function looks like this and the F9 key works:

Public Function SumVisible(a As Range) As Double
  Dim c As Range
  Dim value As Double
  Application.Volatile
  value = 0
 
  For Each c In a
      If c.EntireColumn.Hidden = False And c.EntireRow.Hidden = False Then
          If IsNumeric(c.value) = True Then
              value = value + c.value
          End If
      End If
  Next
  SumVisible = value
End Function

---------------------

To answer the other comment about G2 and I2:K2 do contain numbers and/or blanks.

ASKER CERTIFIED SOLUTION
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pauloaguia
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pauloaguia, that is truly neat. Did not find this trick in the net, yet.

BTW, this hit came up, is only closely related, but could be useful: http://www.cof.orst.edu/net/software/excel/tips/#SelectVisible
Thank you.  Excellent!  It works great.
Thansk for the points. This is one of those questions I enjoyed because I learnt something from it...
More on this:

Your original function was OK after all. Just found out today that all you needed was to use it like so:

=SUMVisible((A1:C1;F1:I1))
OR
=SUMVisible((A1:C1,F1:I1))

(depending on regional settings)

Just imagine. If I'd known this in the first place we'd never have found out about that ParamArray thing... :)
And now we've learned that you can use () to define combined ranges.... neat :)