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MathGroup Archive 2005

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Re: a question about plot a list of functions.

  • To: mathgroup at smc.vnet.net
  • Subject: [mg58206] Re: [mg58203] a question about plot a list of functions.
  • From: "Caffa Vittorio Dr." <Caffa at iabg.de>
  • Date: Wed, 22 Jun 2005 03:04:09 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

  Change
Plot[y, {x, 0, 10 Pi}];
  To
Plot[Evaluate[y], {x, 0, 10 Pi}];

Cheers, Vittorio


>-----Original Message-----
>From: Zhou Jiang [mailto:jiangzhou_yz at yahoo.com]
To: mathgroup at smc.vnet.net
>Sent: Wednesday, June 22, 2005 7:56 AM
>Subject: [mg58206] [mg58203] a question about plot a list of functions.
>
>
>I defined a function as
>
>K=(2 r/(1-r^2))^2;
>y=1/(1+K (Sin[x])^2);
>y=y/.{r->{0.2,0.9,0.995}}
>
>Now the result is a list.
>I want to plot y vs. x in one figure and I did the following
>
>Plot[y, {x, 0, 10 Pi}];
>
>But Mathematica gave me an error.
>I changed it to
>
>Plot[{y[[1]], y[[2]], y[[3]]}, {x, 0, 10 Pi}];
>
>Mathematica gave me a correct plot. Can anyone give me some idea why
the
>error message is given by Mathematica since y is a list and nothing is
>diffrent from {y[[1]], y[[2]], y[[3]]}?
>
>Thanks.
>


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