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MathGroup Archive 2006

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Re: Simple Plot3D/Function Syntax issue

  • To: mathgroup at smc.vnet.net
  • Subject: [mg68602] Re: Simple Plot3D/Function Syntax issue
  • From: Bill Rowe <readnewsciv at earthlink.net>
  • Date: Fri, 11 Aug 2006 04:40:28 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

On 8/9/06 at 11:57 PM, jtolman at gmail.com (JTolman) wrote:

>When I enter f = e^-(x^2 + y^2) (x^2 + 2y^2) It gives me a
>syntax::noinfo error but the output looks like the correct textbook
>style function.

Hmm... When I simply copy, paste then execute the line above in Mathematica 5.2 in a fresh session I don't get an error. Nor would I expect to get an error since the assignment to f is valid Mathematica code.

>Also, when I try to plot it Plot3D[e^-(x^2 + y^2) (x^2 + 2y^2), {x,
>-3, 3}, {y, -3, 3}] It of course gives me not machines-size real
>number errors, which I am assuming have more to do with my original
>syntax error. 

In short, e is not E. Plot3D will continue to give the error until you define the variable e to have a numerical value. I assume you meant to plot Exp[-(x^2 + y^2) (x^2 + 2y^2)]. If so,

Plot3D[E^-(x^2 + y^2) (x^2 + 2y^2), {x, -3, 3}, {y, -3, 3}];

will give you the desired result
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