Re: newbie question
- To: mathgroup at smc.vnet.net
- Subject: [mg45045] Re: newbie question
- From: Bill Rowe <readnewsciv at earthlink.net>
- Date: Sun, 14 Dec 2003 06:22:42 -0500 (EST)
- Sender: owner-wri-mathgroup at wolfram.com
On 12/13/03 at 6:06 AM, kashcow1 at hotmail.com (ak) wrote:
> I'm new to the software, and am having trouble with a simple command:
> Plot3D[Sin[xy], {x, 0, 3}, {y, 0, 3}];
> This is giving me: Plot3D::plnc: Sin[xy] is neither a machine-size
> real number at {x, y}={0., \
> 0.} nor a list of a real number and a valid color directive
> I must be missing something obvious, what could I be doing wrong here?
Yes. You asked Mathematica to plot the sin of a varible named "xy" put did not specify a range for this variable. You probably intended to ask Mathematica to plot the product x*y which Mathematica can understand when written "x y". The space between the x and y is essential.
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