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MathGroup Archive 2004

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Re: Newbie Question -- Plot3d::plnc

  • To: mathgroup at smc.vnet.net
  • Subject: [mg52751] Re: Newbie Question -- Plot3d::plnc
  • From: Helen Read <read at math.uvm.edu>
  • Date: Sat, 11 Dec 2004 05:22:46 -0500 (EST)
  • References: <cpav9n$isv$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

jujubaby at gmail.com wrote:
> X-No-Archive: Yes
> 
> When I enter the following two statements into Mathematica 5:
> 
> xtimesy[x_, y_] := x*y;
> Plot3D[xtimesy[x y], {x, -5, 5}, {y, -5, 5}]
> 
> I receive a huge cascade of errors, all of this form:
> 
> Plot3D::plnc: xtimesy[x\y] is neither a machine-size real number at \
> {x,y}={-5.,-5.} nor a list of a real number and a valid color
> directive.
> 
> What am I doing wrong?

Should be

xtimesy[x_, y_] := x*y;
Plot3D[xtimesy[x,y], {x, -5, 5}, {y, -5, 5}]

--
Helen Read
University of Vermont


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