I still don't know my way around the Sage documentation... Sorry for the
elementary question.
I just tried to use the *solve* command to find the roots of a
polynomial of degree 4 with real coefficients. The result is a list of
solutions expressed in (complicated) symbolic form. When I attempted to
find the numerical value of the solutions, I got an error:
TypeError: cannot evaluate symbolic expression numerically
There must be a way to do this, analogous to the "solve" command in gp.
(I tried gp.solve(t=10,30,P(t)==0), but that gives an error too.)
Fernando
--
=============================================================
Fernando Q. Gouvea http://www.colby.edu/~fqgouvea
Carter Professor of Mathematics
Dept. of Mathematics and Statistics
Colby College
5836 Mayflower Hill
Waterville, ME 04901
The vermine is a small black and white relative of the lemming, found
in the cold Hublandish regions. Its skin is rare and highly valued,
especially by the vermine itself; the selfish little bastard will do
anything rather than let go of it.
-- Discworld wildlife
Terry Pratchett, Sourcery
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