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AW: too many {{}}'s for listplot

  • To: mathgroup at smc.vnet.net
  • Subject: [mg38407] AW: [mg38334] too many {{}}'s for listplot
  • From: Matthias.Bode at oppenheim.de
  • Date: Sat, 14 Dec 2002 03:19:28 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

Hi Encinosa,

try this:

yourlist= {{{0.517671, 9.75893}}, {{0.562696, 8.33465}}, {{0.601599,
    7.26733}}, {{0.635675, 6.38612}}}
Flatten[yourlist]
lst02 = Partition[%, 2]
ListPlot[lst02]

Please note that you have to put an extra pair of braces in the very first
and the very last position of your list to make it a list Mathematica will
accept. It appears to be quite improbable that z2=Table[....] generates the
list structure you quoted; please check.

Best regards,

Matthias Bode.

-----Ursprüngliche Nachricht-----
Von: encinosa [mailto:mencinosa1 at comcast.net]
Gesendet: Donnerstag, 12. Dezember 2002 07:36
An: mathgroup at smc.vnet.net
Betreff: [mg38334] too many {{}}'s for listplot


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




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