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Re: Grad in VectorAnalysis`


Hi Murray,

> After...
> 
>    Needs["VectorAnalysis`"]
>    SetCoordinates[Cartesian[x, y, z]]
> 
>    f[x_, y_] = x/(1 - x^2 - y^2)
> 
> ... why does the following not actually return the formula 
> for gradient...
> 
>    Grad[f[x, y, z]]  (* or even Grad[Evaluate[f[x,y,z]]]
> 
> ... whereas the following does return it:
> 
>    Grad[x/(1 - x^2 - y^2)]

At a guess, it's because of how you've defined f ....

D.



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