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MathGroup Archive 2006

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Re: Graphics--ContourPlot output varies drastically with PlotPoints.

  • To: mathgroup at smc.vnet.net
  • Subject: [mg70998] Re: Graphics--ContourPlot output varies drastically with PlotPoints.
  • From: dh <dh at metrohm.ch>
  • Date: Sat, 4 Nov 2006 04:08:09 -0500 (EST)
  • References: <eiepg9$l2l$1@smc.vnet.net>

Hi Subimal,
look at your wavelength. It is much too small to be resolved by the 
screen resolution. What you are seeing is an effect called aliasing due 
to a small sample rate. If you increase the wavelength you will get 
reasonable pictures.
Daniel


subimaldeb at rediffmail.com wrote:
> Hello,
> 
> I am new to this forum.
> 
> The following code should produce the interference of two plane waves. The output should not show as much variation as the following code shows. Please help me understand where I have gone wrong.
> 
> cm = 1.0;
> fld[E0_, r : {_, _, _}, k : {_, _, _}, ph_] := E0*Exp[I*(k.r + ph)];
> 
> \[Lambda] = .0001*cm;
> k = 2. \[Pi]/\[Lambda];
> z = 100.*cm;
> 
> Table[
>   
>   ListContourPlot[
>       Table[
>         Abs[
>                 fld[1, {x, y, z}, {0, k, 0.}, 0.]
>               + fld[1, {x, y, z}, {k, k, 0.}, 0.]
>             ]^2,
>         {x, -.5*cm, .5*cm, 1*cm/i}, {y, -.5*cm, .5*cm, 1*cm/i}],
>       ContourLines -> False,
>       Contours -> 100,
>       Frame -> True,
>       Background -> None];
>   , {i, 10, 200, 20}];
> 
> 
> 
> With my regards,
> Subimal
> 
> Link to the forum page for this post:
> http://www.mathematica-users.org/webMathematica/wiki/wiki.jsp?pageName=Special:Forum_ViewTopic&pid=14998#p14998
> Posted through http://www.mathematica-users.org [[postId=14998]]
> 
> 


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