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- From: ochealth@unixg.ubc.ca (ochealth)
- Newsgroups: comp.sys.hp48
- Subject: Re: Complex roots for 3rd and 4th order equations
- Message-ID: <1dhjjpINNrcu@iskut.ucs.ubc.ca>
- Date: 7 Nov 92 23:31:05 GMT
- References: <1992Nov4.003713.11346@coe.montana.edu> <1992Nov6.123748.4019@news.uni-stuttgart.de>
- Organization: University of British Columbia, Vancouver, B.C., Canada
- Lines: 38
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- In article <1992Nov6.123748.4019@news.uni-stuttgart.de> TOBIAS@bonnie.physik.uni-stuttgart.de () writes:
- :In <1992Nov4.003713.11346@coe.montana.edu> nate@nate.oscs.montana.edu writes:
- :
- :> Forgive me if this is a simple question, but a friend of mine has a TI-68
- :> which can solve 3rd and 4th order equations, and I can't get my 48SX to
- :> give me more than one solution to the equation, and that root is always real.
- :>
- :> Is there an easy way to do this, or even a difficult way to do this?
- :>
- :> It's kind of embarassing to be outdone by a $35 calculator.
- :>
- :> Thanks,
- :>
- :
- :No problem. You only have to put the formulas for the roots into your
- :computer. They can be found in every mathemtical standard lexica.
- :I think the 4th order case is labeled "formula of ferrari".
- :
- :But if you need them (of course they are a little bit long) in
- :a executable HP format i can send you (or post) the 2 programs. I use them
- :in order to get the eigenvalues of 3 and 4 dim. matrices.
- :
-
-
- Or you could just download Bill Wickes' PROOT numerical root finder.
- It will quickly find real or complex roots of any real polynomial.
-
- This is one the Classic HP programs. I think the machine code FFT program
- is another classic util.
- :Bye. Tobias.
- :
-
-
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