Re: Problems evaluating Grad
- To: mathgroup at smc.vnet.net
- Subject: [mg39424] Re: Problems evaluating Grad
- From: "Steve Luttrell" <luttrell at _removemefirst_westmal.demon.co.uk>
- Date: Fri, 14 Feb 2003 03:24:16 -0500 (EST)
- References: <b2fpvg$k66$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Evaluate SetCoordinates[Cartesian[a, b, c]] before you evaluate the Grad. -- Steve Luttrell West Malvern, UK "Konrad Den Ende" <chamsterkonrad at bigfoot.com> wrote in message news:b2fpvg$k66$1 at smc.vnet.net... > I'd like to detrmine Grad to a function so i go: > <<Calculus`VectorAnalysis` > f[x_,y_]:=x+y > > Grad[f[a,b]] > > I get no errors, but the answer is simply the same thing > that i asked, as if no computation was done. What do i > do wrong? > > Also - when i evaluated the examples in Help i got the same > behavior. The answer that already is there gets exchanged > to something else upon my evaluation. Namely, the question > itself. What is that?! > > -- > > Vänligen > Konrad > --------------------------------------------------- > phone #1: (+46/0) 708 - 70 73 92 > phone #2: (+46/0) 704 - 79 96 95 > url: http://konrads.webbsida.com > e-mail: chamsterkonrad at bigfoot.com > ----------------------------------- > > Sleep - thing used by ineffective people > as a substitute for coffee > > Ambition - a poor excuse for not having > enough sence to be lazy > --------------------------------------------------- > > > > > > >