Re: Grad in VectorAnalysis`
- To: mathgroup at smc.vnet.net
- Subject: [mg103866] Re: [mg103822] Grad in VectorAnalysis`
- From: DrMajorBob <btreat1 at austin.rr.com>
- Date: Fri, 9 Oct 2009 07:19:37 -0400 (EDT)
- References: <200910081149.HAA13507@smc.vnet.net>
- Reply-to: drmajorbob at yahoo.com
You defined f with two arguments and used it with three. No workee. Bobby On Thu, 08 Oct 2009 06:49:55 -0500, Murray Eisenberg <murray at math.umass.edu> wrote: > 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)] > > > -- DrMajorBob at yahoo.com
- References:
- Grad in VectorAnalysis`
- From: Murray Eisenberg <murray@math.umass.edu>
- Grad in VectorAnalysis`