Re: Simple Plot3D/Function Syntax issue

*To*: mathgroup at smc.vnet.net*Subject*: [mg68600] Re: Simple Plot3D/Function Syntax issue*From*: "Stratocaster" <stotz1 at verizon.net>*Date*: Fri, 11 Aug 2006 04:40:20 -0400 (EDT)*References*: <ebeb66$ldv$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

"JTolman" <jtolman at gmail.com> wrote in message news:ebeb66$ldv$1 at smc.vnet.net... > 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.