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Re: st: Finding the roots (zeros) of an equation with stata


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Finding the roots (zeros) of an equation with stata
Date   Tue, 9 Jun 2009 16:13:28 +0000 (GMT)

> On Tue, Jun 9, 2009 at 4:46 PM, Nathan Danneman wrote:
> > I would like to find the roots of complex univariate
> > expressions, such as y=x^3+2x^2-5.

--- On Tue, 9/6/09, Tirthankar Chakravarty wrote:
> /* begin */
> clear*
> mata
> polyroots((-5, 0, 2, 1))
> end
> /* end */

If your expression is not a polynomial you can look
at Ben Jann's -moremata- package, and in particular
his -mm_root()- and -mm_nrroot()- commands.

Hope this helps,
Maarten

-----------------------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


      

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