Store results in memory instead of each time writing results in sheet(cell).

Xtophe_S
Xtophe_S used Ask the Experts™
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Dear,

I'm including some accuracy control mechanism in a simulation Tool I build to re-rate made mobile calls.

The tool has a "control modus". If selected, the result (in this case the duration of the call ) is written in the current selected row offset by 18 colums.

When rerating +100K rows, and even with screenupdating and calc disabled, it runs very slow.

Is there a possibility to keep results in the memory (array), and only write the result once, once all rerating has been done.

Select Case ControlModus
    Case Is = "YES", "Yes", "yes"
        ActiveCell.Offset(0, 18).Value = CdrSeconds ' uncomment this in case you want to write control figures next to CDR's
    Case Else
End Select

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Thank you for your help
/Xtophe
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Well... putting values on spreadsheet is, virtually, maintaining values in an array (since these values are in memory).   With +100k rows... and understanding how Excel maintains row data in memory... you're probably better off using the spreadsheet method versus memory arrays.  

But, depending on how you use this data in your application... you may want to write your data to a sheet like a table (1st row contains headers, all other rows contain data) and access your data on the sheet by opening it like a table and query your data using SQL type statements.

Scott C
Most Valuable Expert 2011
Top Expert 2011
Commented:
Writing 100k cells one by one will be very very slow, so yes you would be far better off writing the results to an array and then writing that to the sheet in one go using a simple:
Range("Y1").Resize(ubound(myarray, 1), ubound(myarray, 2)).Value = myArray

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syntax
Have you considered setting Application.ScreenUpdating = False?
The effect would be that no time is spent on updating your screen. Hence, all data are kept in arrays managed by Excel which, arguably, should not be slower than using arrays managed by the user.

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