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Re: two quadratic eq, please help
From: |
Geordie McBain |
Subject: |
Re: two quadratic eq, please help |
Date: |
Mon, 7 Feb 2005 09:46:54 -0500 |
User-agent: |
Mutt/1.5.6+20040907i |
On Sun, Feb 06, 2005 at 12:25:18AM -0800, shih lin wrote:
> dear octave and math programmers:
>
> highly appreciate anyone can tell me how (or hint) to use octave to
> solve:(12-x)^2 + y^2 =15^2, (16+y)^2+x^2=25^2 (by programming or using its
> built
> in function)?
> that ^2 mean square.
> looking to any math&programer's help,
> eric, address@hidden
Create a function to return the residual:
function z = f (x)
z = [(12-x(1))^2+x(2)^2-15^2, (16+x(2))^2+x(1)^2-25^2];
endfunction
and fsolve it:
octave> fsolve ("f", [0, 0])
ans =
1.8887e-15
9.0000e+00
Geordie McBain
www.aeromech.usyd.edu.au/~mcbain
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