Question

Only Re-calcuulate formulae on the active row

Asked by: bowemc

Hi,

i've a spread sheet with about 50 columns. About half of the columns have in cell formulaes for which some the other columns are the inputs for the calculation. The speadsheet operates on a row by row basis. The sheep has about 10,000 rows

Obiously this is a lot of calculations going on!

I was wondering, say I change a value in cell C20 (which is an input), is it possible to only reculculate the formulae on row 20? Recalculating everything on the sheet is a massive and time consuming overhead

I hope I explained this ok. If not just ask for clarity!

Thanks

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Asked On
2009-06-05 at 09:46:12ID24467587
Topic

Microsoft Excel Spreadsheet Software

Participating Experts
3
Points
500
Comments
8

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Answers

 

by: wabashbdwPosted on 2009-06-05 at 10:45:50ID: 24558653

There really isn't any way to do this when cell values are based on formulas.

 

by: CbrinePosted on 2009-06-05 at 11:03:31ID: 24558824

Can you post the sheet or a sample of the sheet for us?  We could take a look at it and see if there is a better way to do the calculations you want with less overhead.

Cal

 

by: brettdjPosted on 2009-06-06 at 01:09:14ID: 24562152

This is possible using VBA

Assuming you have spreadsheet calcukation on manual

  1. Right click your sheet tab 
  2. View - Code 
  3. Copy and paste in the code below 

If a cell is changed in within row 20, then all cells in row 20 are calculated, but no other others on the sheet are updated

Cheers

Dave

 


Private Sub Worksheet_Change(ByVal Target As Range)
Dim rng1 As Range
Set rng1 = Intersect(Rows("20"), Target)
If Not rng1 Is Nothing Then Rows("20").Calculate
End Sub
                                              
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by: bowemcPosted on 2009-06-07 at 03:32:39ID: 24565938

Hi Dave,

That looks good. I se row 20 is hard coded. How could I implement this for all rows on a sheet and not just row 20?

Cheers

 

by: brettdjPosted on 2009-06-07 at 03:39:35ID: 24565950

simply this

hth

Dave


Private Sub Worksheet_Change(ByVal Target As Range)
ActiveSheet.Calculate
End Sub
                                              
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by: bowemcPosted on 2009-06-07 at 11:08:30ID: 24567454

Sorry. I mightn't have explained very well.

I don't want to calculate everything on the sheet. The first segment of code you contributed had row 20 hard coded. I want to change this so it uses the row that has changed (in place of 20). The second code segment you gave re-calculates every row - which is what I originally had and it drains performance.

Thanks

 

by: brettdjPosted on 2009-06-07 at 22:17:17ID: 24569308

No probs, try this

Cheers

Dave

Private Sub Worksheet_Change(ByVal Target As Range)
Target.EntireRow.Calculate
End Sub

                                              
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by: brettdjPosted on 2009-09-11 at 06:54:47ID: 25309523

still there? :)

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