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Topic: Re: [mg4659] --->What is the problem with 'ParametricPlot'?
Replies: 0

 Chee Lim Cheung/MS/SP_SF Posts: 2 Registered: 12/7/04
Re: [mg4659] --->What is the problem with 'ParametricPlot'?
Posted: Aug 25, 1996 6:05 PM

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
To: mathgroup @ smc.vnet.net @ INTERNET
cc: (bcc: Chee Lim Cheung/MS/SP_SF)
From: whoami @ hknet.com (Seagull) @ INTERNET @ SP_SD
Date: 22/08/96 03:55:12 AM
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?

Seagull.