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MathGroup Archive 2003

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Re: Baffling Failure when plotting multiple curves.

  • To: mathgroup at smc.vnet.net
  • Subject: [mg44173] Re: Baffling Failure when plotting multiple curves.
  • From: bobhanlon at aol.com (Bob Hanlon)
  • Date: Sat, 25 Oct 2003 06:26:23 -0400 (EDT)
  • References: <bnao48$4ei$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

See on-line help for Plot regarding use of Evaluate with Plot's arguments

voteCurves[pnts_List]:=
    pnts.{Cos[t*Degree],Sin[t*Degree]};

voteCurves[{{a,b},{c,d},{e,f}}]

{a*Cos[Degree*t] + b*Sin[Degree*t], c*Cos[Degree*t] + 
   d*Sin[Degree*t], e*Cos[Degree*t] + f*Sin[Degree*t]}

p1 = {158, 116};
p2 = {74 , 135};

Plot[
    Evaluate[voteCurves[{p1,p2}]],
    {t,-90,180},
    AxesOrigin->{0,0},
    PlotRange->{{-90,180},{0,255 Sqrt[2]}},
    AspectRatio->1,
    Frame->True];


Bob Hanlon

In article <bnao48$4ei$1 at smc.vnet.net>, Bob Harris <nitlion at mindspring.com>
wrote:

<< Am having trouble getting collections of 2D function plots to work.  I have
created a function that returns a list of "equations" in one variable,
theta.  I.e. an equation is an expression like 17 Cos[theta] + 10
Sin[theta].  When I try to plot this list of functions AS THE RETURN VALUE
OF MY FUNCTION, Mathematica complains (details below).  However, if I
evaluate the function first, then cut and paste the result into the call to
Plot, it works ok (but this is not very useful to me, since I want to
incorporate this into a larger function).  Further, if my function returns a
list with only one equation in it, then handing the function call to Plot
works.  I'm clueless as to what he difference is. >><BR><BR>


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