Cells w/ user defined function do not auto update

[John]

I have an excel 2007 file with worksheets for each month. The Feb-Dec sheets
each have cells that contain the formula "=B25+PrevSheet(F25)" to accumulate
the sum of corresponding cells of earlier month worksheets using a function
"PrevSheet(x)" that I wrote to pick up the specified cell value from the
previous month worksheet. Each worksheet has a fairly large number of cells
that use this formula.

When I make changes in earlier month sheets the following month sheets do
not automatically update their cumulative values. Clicking Recalculate does
not perform and update either. The only way I seem to be able to update
these cum cells is to select each one, click up in the formula bar and then
press enter. This is a very tedious process.

How can I get the cells to update automatically?

Thank you for your help, John

 

[Bob Phillips]

If you add Application.Volatile at the start of your UDF, you will only have
to force the recalculation once, all the others will then also update.

 

[John]

That took care for it. Thx so much Bob.

If you add Application.Volatile at the start of your UDF, you will only have
to force the recalculation once, all the others will then also update.

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HTH

Bob