On 8/6/10 11:57 AM, Bastiaan Bergman wrote:
> Exactly! And that "re-arranging by hand" I would like to have some tips for,
> or preferably some handy CAS routines. My expr is a very big and complicated
> structure of mainly cosh and sinh, I know its right because it gives the
> right answer for small x. Just larger x cannot be evaluated, very
> frustrating...
The symbolic results are not always the best for numerical computation.
And, I suspect as your expressions become larger, they become less
amenable to simple numerical evaluation. Even something as simple as
the quadratic formula is not so stable for numerical work.
For large x, perhaps an asymptotic formula for your expressions would be
good to have. Or maybe even just exponentializing the expression would
help.
> Anyway, thanks for the B-float tips, for sure nice to play with too.
Arbitrary precision certainly helps with numerical evaluation if you can
afford it. :-)
Ray