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.

**Follow-Ups**:**Re: a question about plot a list of functions.***From:*Andrzej Kozlowski <andrzej@akikoz.net>