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MathGroup Archive 1998

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plotting findroot

  • To: mathgroup at smc.vnet.net
  • Subject: [mg13412] plotting findroot
  • From: fanning at leland.stanford.edu (Geoff Fanning)
  • Date: Thu, 23 Jul 1998 03:32:57 -0400
  • Sender: owner-wri-mathgroup at wolfram.com

I'm trying to plot the results of FindRoot where one parameter changes,
but I'm get tons of error messages about not being a length one list of
numbers even though I can execute FindRoot w/out error if I specify a
single value of the parameter of interest. Often, after a long wait,
the plot emerges anyway. Could someone send me some email about what
I'm doing wrong, or what I might do to speed up the plotting and get
rid of all the error messages that don't seem to be actually producing
errors in the end result?

   TIA,

   Geoff

Plot[t/.FindRoot[(Abs[eigenvalues[[1]]]/.{p->0.0650458,pa->0.00511816})==(
          Abs[eigenvalues[[2]]]/.{p->0.0650458,pa->0.00511816}),{t,
        \[Pi]/4-0.05,\[Pi]/4+0.05}],{g,0,0.065}];

FindRoot::"frnum": 
    "Function \!\({\\[LeftSkeleton] 1 \\[RightSkeleton]}\) is not a
length \!\ \(1\) list of numbers at \!\(t\) =
\!\(0.735398163397448278`\)."

ReplaceAll::"reps": 
    "\!\({\\[LeftSkeleton] 1 \\[RightSkeleton]}\) is neither a list of \
replacement rules nor a valid dispatch table, and so cannot be used for
\ replacing."

FindRoot::"frnum": 
    "Function \!\({\\[LeftSkeleton] 1 \\[RightSkeleton]}\) is not a
length \!\ \(1\) list of numbers at \!\(t\) =
\!\(0.735398163397448278`\)."

FindRoot::"frnum": 
    "Function \!\({\\[LeftSkeleton] 1 \\[RightSkeleton]}\) is not a
length \!\ \(1\) list of numbers at \!\(t\) =
\!\(0.735398163397448278`\)."

General::"stop": 
    "Further output of \!\(FindRoot :: \"frnum\"\) will be suppressed
during \ this calculation."

ReplaceAll::"reps": 
    "\!\({FindRoot[\(\\[LeftSkeleton] 1 \\[RightSkeleton]\)]}\) is
neither a \ list of replacement rules nor a valid dispatch table, and
so cannot be used \ for replacing."

$Aborted


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