<>
http://www.stata.com/support/faqs/res/statalist.html#noanswer
http://www.stata.com/statalist/archive/2009-05/msg00215.html
HTH
Martin
-----Ursprüngliche Nachricht-----
Von: [email protected]
[mailto:[email protected]] Im Auftrag von John Bates
Gesendet: Freitag, 8. Mai 2009 15:25
An: Stata
Betreff: st: mata polyroots issue
<>
Hi,
I am running Stata 10.1 on Mac OS 10.4. The following issue is perplexing
me:
-------
mata:
mata clear
polynomial1 =
(1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,-30,29)
polyeval(polynomial1,1)
polyroots(polynomial1)
-------
The
polyeval line makes it clear that x=1 is a root for this polynomial.
However, 1 is not a reported result for polyroots. What is odd is that
if I add or subtract a zero term to the polynomial, polyroots() will
then correctly report x=1 as a root. i.e., the following works:
-------
mata:
mata clear
polynomial1 =
(1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,-30,29)
polynomial2 =
(1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,-30,29)
polynomial3 =
(1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,-30,29)
polyroots(polynomial2)
polyroots(polynomial3)
-------
Does anybody know what is going on here?
Lirac
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