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MathGroup Archive 1996

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Re: --->What is the problem with 'ParametricPlot'?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg4695] Re: [mg4659] --->What is the problem with 'ParametricPlot'?
  • From: Chee Lim Cheung/MS/SP_SF <CheeLC at sp.ac.sg>
  • Date: Sun, 25 Aug 1996 18:23:20 -0400
  • Sender: owner-wri-mathgroup at wolfram.com

Remove the curly braces {} from the assignments for x and y and all will be 
well.

e.g., x = Sin[t]^3
 y = Cos[t]^3

which mean the same thing as

 x = (Sin[t])^3
 y = (Cos[t])^3

> From: whoami @ hknet.com (Seagull) @ INTERNET @ SP_SD
> Subject: [mg4659] --->What is the problem with 'ParametricPlot'?

I input the followings:
x={Sin[t]}^3
y={Cos[t]}^3
ParametricPlot[{x, y}, {t, 0, Pi/2}]

And got the following outputs:
ParametricPlot::ppcom: 
   Function x cannot be compiled; plotting will proceed with the
     uncompiled function.
ParametricPlot::ppcom: 
   Function y cannot be compiled; plotting will proceed with the
     uncompiled function.
ParametricPlot::pptr: 
   x does not evaluate to a pair of real numbers at t = 0..
ParametricPlot::pptr: 
   x does not evaluate to a pair of real numbers at t = 0.0654498.
ParametricPlot::pptr: 
   x does not evaluate to a pair of real numbers at t = 0.1309.
General::stop: 
   Further output of ParametricPlot::pptr
     will be suppressed during this calculation.


Can anyone tell me what is wrong?
Thanks in advance!!

Seagull.

 


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