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MathGroup Archive 2007

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Re: Aspect Ratio question

  • To: mathgroup at
  • Subject: [mg81306] Re: [mg81278] Aspect Ratio question
  • From: Murray Eisenberg <murray at>
  • Date: Wed, 19 Sep 2007 05:18:06 -0400 (EDT)
  • Organization: Mathematics & Statistics, Univ. of Mass./Amherst
  • References: <>
  • Reply-to: murray at

If you're really using Plot, then set AspectRatio->Automatic, e.g.:

   Plot[Sqrt[1 - x^2], {x, -1, 1}, AspectRatio -> Automatic]

If, though, you're using ParametricPlot, then Automatic is the default 
value for option AspectRatio and you don't need to set it yourself.  For 

   ParametricPlot[{Cos[t], Sin[t]}, {t, 0, 2 Pi}]

Don't even think about the physical characteristics of your display device!

Steven Siew wrote:
> I'm really confused about the steps needed to calculate an Aspect
> Ratio for 2D ploting in mathematica.
> What I want is to plot a circle as a circle on the monitor and not as
> an ellipse.
> My monitor has a physical aspect ratio of  16:10 (aka widescreen
> monitor).
> My monitor has the resolution of  1280 X 800 pixels.
> What should I set the aspect ratio parameter to in Plot[] ?

Murray Eisenberg                     murray at
Mathematics & Statistics Dept.
Lederle Graduate Research Tower      phone 413 549-1020 (H)
University of Massachusetts                413 545-2859 (W)
710 North Pleasant Street            fax   413 545-1801
Amherst, MA 01003-9305

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