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MathGroup Archive 2000

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Re: pure functions (or not?)

  • To: mathgroup at smc.vnet.net
  • Subject: [mg22246] Re: [mg22217] pure functions (or not?)
  • From: "Richard Palmer" <rhpcvn at tiac.net>
  • Date: Sat, 19 Feb 2000 01:33:47 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

I suspect it is because f[0,0,k] doesn't work and the plot tries to evaluate
it at that point.  Your plot needs to avoid that point or define what the
function means there.

Regards,

Richard Palmer
-----Original Message-----
From: Dr Sebastien NEUKIRCH <ucessne at ucl.ac.uk>
To: mathgroup at smc.vnet.net
Subject: [mg22246] [mg22217] pure functions (or not?)


>
>Hi there,
>
>I have a problem with functions.
>Why is the following not working :
>In[1]:=
>function[{x_,y_,z_}]:=
>Module[{a,fr},fr=FindRoot[z+x*Sin[a]-y*a,{a,1.1}];fr[[1,2]]]
>
>In[2]:=
>function[{-1,-2,3}]
>
>Out[2]=
>-1.96219
>
>In[3]:=
>ContourPlot[function[{x,y,3}],{x,-2,2},{y,0,2},Contours->{0}]
>
>In[4]:=
><<Graphics`ContourPlot3D`
>In[5]:=
>ContourPlot3D[function[{x,y,z}],{x,-2,2}, {y,0,2}, {z,-2,2}]
>
>
>---------------------------
>The contourplot3d doest NOT work. Even if I add
>COMPLIED->TRUE.
>
>Thanks for any help or explanation,
>
>Seb
>
>Sebastien Neukirch
>        Centre for Nonlinear Dynamics
>s.neukirch at ucl.ac.uk
>        University College London
>http://www.ucl.ac.uk/~ucessne
>        London WC1 6BT     U.K.
>Tel : +44 171 504 27 27
>        Fax : +44 171 380 09 86
>
>
>
>



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