       # Re: How to draw an ellipse?

```
Krishnan Jayakrishnan wrote:

> Does any one know how to construct an ellipse? For example an ellipse
> centered at (0,0) with intercepts at (-a,0,(a,0),(0,-b),(0,b) with
> parametric equation
> x(t) = a*cos(t)
> y(t) = b*sin(t)
> with t increasin from 0 to 2pi radians. --

In:=
x[t_] = a*Cos[t];
y[t_] = b*Sin[t];

In:=
a= 2; b = 1;

In:=
ParametricPlot[{x[t],y[t]},{t,0,2Pi}, AspectRatio-> Automatic];

AspectRatio-> Automatic is needed to get the same scales in x and y
directions.

Instead of functions you can use formulas:

In:=
Clear[x,y]

In:=
{x,y} = {a Cos[t],b  Sin[t]};

In:=
ParametricPlot[{x,y},{t,0,2Pi},
AspectRatio-> Automatic];

--
Allan Hayes
Training and Consulting
Leicester, UK
hay@haystack.demon.co.uk
http://www.haystack.demon.co.uk
voice: +44 (0)116 271 4198
fax: +44 (0)116 271 8642

```

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