Mathematica 9 is now available
Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2005
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2005

[Date Index] [Thread Index] [Author Index]

Search the Archive

a question about plot a list of functions.

  • To: mathgroup at smc.vnet.net
  • Subject: [mg58203] a question about plot a list of functions.
  • From: Zhou Jiang <jiangzhou_yz at yahoo.com>
  • Date: Wed, 22 Jun 2005 01:55:51 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

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.



  • Prev by Date: Re: Re: Portable Notebooks and Filenames[]
  • Next by Date: Re: Problems with my first package: Statistics`Common`RegressionCommon`BestFitParameters instead of BestFitParameters
  • Previous by thread: Re: a small problem from a newbee...
  • Next by thread: Re: a question about plot a list of functions.