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Field calc failure, division?

11-04-2011 01:21 PM
New Contributor III
I'm trying to a percent change for some fields.  I have the amount increased by, and I have the previous value.  So I made a new field, and asked the field calc to [Increase] / [Previous].  It fails, and gives me the following.

General error executing calculator.
ERROR 999999: Error executing function.
Failed to execute (CalculateField).

It's a fairly basic operation, and works even on a cheap calculator.  Anyone know what I'm doing wrong?
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2 Replies
MVP Honored Contributor
Is there any case where [Previous] = 0? If so, ArcMap gets confused when dividing by 0 (I bet your cheap calculator does, too). Skip over 0s with the code block.
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Esri Regular Contributor
Also, make sure the target field type is Double with sufficient storage to hold the resulting value.
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