Re: too many {{}}'s for listplot
- To: mathgroup at smc.vnet.net
- Subject: [mg38364] Re: too many {{}}'s for listplot
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Fri, 13 Dec 2002 04:09:02 -0500 (EST)
- Organization: Universitaet Leipzig
- References: <at9d0g$q2s$1@smc.vnet.net>
- Reply-to: kuska at informatik.uni-leipzig.de
- Sender: owner-wri-mathgroup at wolfram.com
Hi,
ListPlot[z2 /. {{a_?NumericQ,b_?NUmericQ}}:>{a,b}]
Regards
Jens
encinosa wrote:
>
> i am trying to do a poincare map. i generate x[t] and x'[t]. i write
>
> z2 = Table[Evaluate[{x[t] , x'[t]} /. %], {t, 0, 10, .005}]
> ListPlot[z2]
>
> and i get a set of values that looks like
>
> {{0.517671, 9.75893}}, {{0.562696, 8.33465}}, {{0.601599,
> 7.26733}}, {{0.635675, 6.38612}},....
>
> the problem is when i use
>
> ListPlot[z2]
>
> i get the dreaded "is not a list of numbers" error. if i remove the extra
> parenthesis by hand it works, but thats a tedious business several hundred
> points. i am sure this is a simple thing to fix. i would appreciate any
> help.
>
> mario