(1) -> eval(integrate(exp(x*c),c),x=-2.3)
- 2.3 c
(1) - 0.4347826086_9565217391 %e
Type:
Expression(Float)
On 6 April 2017 at 18:25, 'Nasser M. Abbasi' via FriCAS - computer algebra
system <[email protected]> wrote:
>
>
> On Thursday, April 6, 2017 at 5:11:23 PM UTC-5, Waldek Hebisch wrote:
>>
>> 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
>>
>
>
> I see. But I do not think Maple converted decimal point number to rational
> in
> the following:
>
> restart;
> int(exp(-2.3*c),c);
>
> -0.4347826087 <(434)%20782-6087> exp(-2.300000000 c)
>
> But now I understand different systems do things differently and that
> Fricas needed explicit conversion done before the call.
>
> thanks,
> --Nasser
>
>
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