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Re: Ellipse Drawing


On Tuesday, March 25, 2003, at 03:01 AM, caroline nyhan wrote:

> Hi,
>
> I have a question concerning using mathematica to draw
> the cross-sectional pattern of the polarisation
> ellipse.
>
> I want to know how I would draw an ellipse, in the XY
> plane, with propagation in the positive z-direction,
> by specifying its
> - azimuth (angle that the major axis of the
> cross-sectional ellipse makes with the horizontal
> x-axis (positive when counterclockwise from x-axis))
> - ellipticity (measure of the fatness of the ellipse,
> (ratio of the lengh of the semi-minor axis to that of
> the semi-major axis))
>

I get pretty good results with

ParametricPlot[{e Cos[t] Cos[azimuth] - Sin[t] Sin[azimuth],
         e Cos[t] Sin[azimuth] + Sin[t] Cos[azimuth]} /. {e->1/2,
         azimuth->Pi/2}, {t, 0, 2 Pi}, AspectRatio->e]

Regards,

Sseziwa



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