TIB: Re: [Fwd: Graphing circles, elipses, etc on 82]


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TIB: Re: [Fwd: Graphing circles, elipses, etc on 82]




You need to isolate y in the equation:

For a circle:

x^2 + y^2 = r
y^2 = r - x^2
y = [squareroot](r - x^2)  or  y = -[squareroot](r - x^2)

So you have to enter the following functions :
Y1 = [squareroot](r - x^2)
Y2 = -[squareroot](r - x^2)

You could put Y2 = -Y1, but that only works for circles, not with
ellipses or other conics.

The circle will not always be completely drawn (it might be missing
the sides) but thats because of the way the calc decides wich pixels
to draw.

Hope this helps,

Philipp Keller


----- Original Message -----
From: Matt <monkey_inc@geocities.com>
To: <ti-basic@lists.ticalc.org>
Sent: 29 May 1999 16:03
Subject: TIB: [Fwd: Graphing circles, elipses, etc on 82]


>
>
> I have an 82
> How do i graph circles, elipses, etc?  I know i've got to change
modes
> or somthin.
> IE: 9x2+y2-2y=80
> IE: x2+y2-10y=0
>



References: