Nasser M. Abbasi wrote:
>
> Newbie here.
>
> I read the page
>
> http://axiom-wiki.newsynthesis.org/SymbolicIntegration?root=FriCAS%20Problems
>
> And still can't figure what syntax to use for this. Suppose I want to do
>
> integrate( exp(-2.3*c),c)
>
> This gives an error, because 2.3 is floating point. I tried:
>
> integrate( exp(-2.3*c),c)@Float
> integrate( exp(-2.3@Float*c),c)
>
> How does one handle the above? Do I really have to enter it as
>
> integrate( exp(-23/100*c),c)
>
> For Fricas to process it?
FriCAS can not integrate expressions containing floating
point numbers. Some systems will quietly convert floating
point numbers to rationals, but FriCAS philosopy is to
make such convertions explicit. Now, there are many ways
to get rational:
- writing 23/100 is most natural
- you can request convertion to rational by
retract(2.3)@Fraction(Integer)
- or you may explicitely specify desired accuracy of convertion
rationalApproximation(2.3, 3)
(note that specifying lower accuracy will give you different
approximation)
--
Waldek Hebisch
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