MathGroup Archive 1997

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Mathematica Graphics

  • To: mathgroup at
  • Subject: [mg8846] Mathematica Graphics
  • From: David Djajaputra <dd4b at>
  • Date: Mon, 29 Sep 1997 02:40:18 -0400
  • Organization: University of Virginia
  • Sender: owner-wri-mathgroup at

Could anyone tell me how to make Mathematica plot the following function

Wbar[q_,w_]:=w/(4 Sin[q/2]);

  EllipticF[Pi/2 - ArcSin[Wbar[q,w]], 1/(1-Wbar[q,w]^2)]  /

  If[(w>2 Sin[q])&&(w < 4 Sin[q/2]), Chi[q,w]/(2 Pi Sin[q/2]),0];


If I run the last Plot command, Mathematica always complains about
ChiPlot[w] not being a machine-size real number at some points, and then
it only plots several disconnected lines. I realize the function is
rather `dangerous' but analytically  I expect it  to behave normally
inside the region that I use above, except perhaps at the
boundaries. Anyway, if Mathematica can get the separate lines, why can't
it obtain
the values for points between the lines also?

Much thanks in advance,

David Djajaputra

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