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Re: What do I do to get better curves?

• To: mathgroup at smc.vnet.net
• Subject: [mg120993] Re: What do I do to get better curves?
• From: "becko" <becko565 at hotmail.com>
• Date: Sun, 21 Aug 2011 05:30:41 -0400 (EDT)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com
• References: <201108170953.FAA01443@smc.vnet.net>

Thanks all for your suggestions. Dividing a[k,w] by p[k,w] and making a 
contour plot of the result (equated to zero) did the trick.

--------------------------------------------------
From: "becko" <becko565 at hotmail.com>
Sent: Wednesday, August 17, 2011 2:53 AM
To: <mathgroup at smc.vnet.net>
Subject: [mg120993] What do I do to get better curves?

> Run the following code in mathematica:
>
> r=6197/3122;
> p[k_,w_]:=Sqrt[w^2/r^2-k^2];q[k_,w_]:=Sqrt[w^2-k^2];
> a[k_,w_,p_,q_]:=(k^2-w^2)^2 Sin[p]Cos[q]+4k^2 p q Cos[p]Sin[q]
> a[k_,w_]:=a[k,w,p[k,w],q[k,w]];
> ContourPlot[a[k,w]==0,{w,0,6},{k,0,14}]
>
> The curves thus obtained are very inaccurate. I tried raising the
> PlotPoints and WorkingPrecision opions of ContourPlot, but it doesn't
> work. Morevoer, you see that the only parameter that shows up, 'r', is
> an exact rational number. I don't know what else to try. Thanks.
>
> 

• References:
  • What do I do to get better curves?
    • From: "becko" <becko565@hotmail.com>