Hi Remi, > > I received the above message when doing the field difference of two fields > over the same grid but with different resolutions (i.e. number of points). > > Is that normal? > The IDV can handle different resolutions. However, it looks like you are mixing a 2D field with a 3D field. If so, that won't work, even if you select a level for the 3D field. The simple difference formula just uses "a-b" which does not try to convert a 3D field into a 2D field. However, you can use the built in routine "sub" which will do that. So, just create a new formula (Edit->Formulas->Create Formula). Name it something and in the formula field use: sub(a,b) Now, when you evaluate that formula you will be prompted for the a and b fields. If you are using a 3D field just make sure you also select a level. -Jeff To get this to w Ticket Details =================== Ticket ID: AYP-789112 Department: Support IDV Priority: Normal Status: Closed
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