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Re: non-continguous ParametricPlot?

• To: mathgroup at smc.vnet.net
• Subject: [mg20401] Re: non-continguous ParametricPlot?
• From: "Allan Hayes" <hay at haystack.demon.co.uk>
• Date: Tue, 26 Oct 1999 00:32:53 -0400
• References: <7uefce$250@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

Rita Bijlsma <R.Bijlsma at iri.tudelft.nl> wrote in message
news:7uefce$250 at smc.vnet.net...
> Hi All,
>
>   Is it in some way possible to define a non-continguous
>   Parametric Plot, one that consist of several lines that
>   are not connected to each other: to skip over regions were
>   the relation is not defined, without a meaningless line connecting
>   the meaningful lines.  I don't like to define a separate line
>   with its own name for different parts of the same relation.
>
>
>                              Thanks for all and any help!
>                                                            Rita
>
>
> --
>   .-. || Drs. Rita Bijlsma                 tel: +31-15-2787109
>  /   \|| IRI dept of Radiation Physics     fax: +31-15-2786422
>  |   ||| Delft University of Technology  email: rita at iri.tudelft.nl
>  |   |||_The Netherlands ______________ http://www.iri.tudelft.nl/~rita
>

Rita,
Yes:

Plot[Sqrt[x^2 - 1], {x, -2, 2}]

And , for ParametricPlot with messages turned off and then on:

Off[ParametricPlot::"pptr"];
ParametricPlot[{x, Sqrt[x^2 - 1]}, {x, -2, 2}]
On[ParametricPlot::"pptr"];

Allan
---------------------
Allan Hayes
Mathematica Training and Consulting
Leicester UK
www.haystack.demon.co.uk
hay at haystack.demon.co.uk
Voice: +44 (0)116 271 4198
Fax: +44 (0)870 164 0565