Hello I´m trying to calclulate Wind Speed from u and v Values which I have in an Attribute Table. Basically the function should calclulate when u and v are simultaneously different from 0 If u and v are simultaneously different from 0 then the function should calculate Sqr(u**2 + v **2) In the Code-Block I typed: Dim z as double u = [GRID_COD_1] v = [GRID_CODE] If (( u = 0) And (v = 0)) Then z = 0 elseIf (( u <> 0) and (v <> 0)) Then z= Sqr(( u **2) + (v **2)) EndIf and after that z=speed but it diosnt seem to work. What do I do wrong? Greets, Christian
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