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Re: Simple Plot3D/Function Syntax issue

  • To: mathgroup at
  • Subject: [mg68600] Re: Simple Plot3D/Function Syntax issue
  • From: "Stratocaster" <stotz1 at>
  • Date: Fri, 11 Aug 2006 04:40:20 -0400 (EDT)
  • References: <ebeb66$ldv$>
  • Sender: owner-wri-mathgroup at

"JTolman" <jtolman at> wrote in message 
news:ebeb66$ldv$1 at
> 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.
> 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.  I've tried
> several variations but can't figure out what needs to be corrected.

Define "f" as a function with two variables (because it is a function of two 
variables).  Then try graphing the function in Plot 3D.  Like this:

f[x_, y_] =e^-(x^2 + y^2) (x^2 + 2y^2);

Plot3D[f[x,y],{x, -3, 3}, {y, -3, 3}]

Does it look good now?  Practice defining functions.

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