Re: Grad in VectorAnalysis`
- To: mathgroup at smc.vnet.net
- Subject: [mg103862] Re: [mg103822] Grad in VectorAnalysis`
- From: "David Annetts" <david.annetts at iinet.net.au>
- Date: Fri, 9 Oct 2009 07:18:51 -0400 (EDT)
- References: <200910081149.HAA13507@smc.vnet.net>
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.
- References:
- Grad in VectorAnalysis`
- From: Murray Eisenberg <murray@math.umass.edu>
- Grad in VectorAnalysis`