[TI-M] Re: Matrices for simultaneous equations


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[TI-M] Re: Matrices for simultaneous equations




I would like to see this.  The program I wrote used two lines divided
equally and the lines index about their mid points 90 degrees to intersect
for the center of a circle. And the distance from one of the outer points to
the center for the radius.

Using a matrix would be more elegant.  I have used matrix to solve cubic
splines given the slops.

Thanks.

----- Original Message -----
From: "Korny" <raykornele@ivillage.com>
To: <ti-math@lists.ticalc.org>
Sent: Monday, February 18, 2002 6:05 PM
Subject: [TI-M] Re: Matrices for simultaneous equations


>
> On Mon, 18 February 2002, "Nathan Walters" wrote:
>
> >
> >
> > It's been forever, but using matrices you can solve simultaneous
> > equations.  Look it up on the web somewhere.  I used to have a program
> > floating around that I made once for the 82 that would do just that.
> > Goodluck!
>
> Set the equations up as
> A1x + B1y + C1z = D1
> A2x + B2y + C2z = D2
> A3x + B3y + C3z = D3
>
> Then write matrix [A] as
> [A1 B1 C1]
> [A2 B2 C2]
> [A2 B2 C2]
>
> and matrix [B] as
> [D1]
> [D2]
> [D3]
>
> Then use [A](x^-1)[B]
>
> For the (x^-1) operator use the reciprocal key function. The written out
function doesn't work.
>
> Korny
>
> PS. There is also a way to use this method to solve for a circle passing
through three points.
>
> If anyone is interested, I'll post it.
>
>




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