Do you recommend Sage-9.2 for the users if they're working with Sage-9.1?
On Tue, Sep 29, 2020 at 12:54 PM Eric Gourgoulhon <egourgoul...@gmail.com>
wrote:
> I confirm the issue with the Taylor series with Sage 9.1. Fortunately, the
> bug seems to have been fixed for Sage 9.2. As Emmanuel, I get the correct
> Taylor series with Sage 9.2.beta13.
>
> Le mardi 29 septembre 2020 à 09:36:09 UTC+2, Emmanuel Charpentier a écrit :
>
>> I can’t reproduce your problem :
>>
>> sage: sage.version.version
>> '9.2.beta13'
>> sage: var('t')
>> t
>> sage: assume(x>0)
>> sage: f(x)=integrate(sin(t)/t,t,0,x)
>> sage: f
>> x |--> sin_integral(x)
>> sage: taylor(f(x),x,0,10)
>> 1/3265920*x^9 - 1/35280*x^7 + 1/600*x^5 - 1/18*x^3 + x
>>
>> My platform is Debian testing running on core i7 + 16 GB RAM ; sage is
>> built to use as much system packages as possible. hat are your platforms ?
>>
>> HTH,
>>
>> Le lundi 28 septembre 2020 à 22:03:56 UTC+2, fqgo...@colby.edu a écrit :
>>
>>> I am trying to see how to do a standard calculus exercise in Sage. I
>>> want a power series for the integral of sin(x)/x. I tried:
>>>
>>> sage: var('t')
>>> t
>>> sage: assume(x>0)
>>> sage: f(x)=integrate(sin(t)/t,t,0,x)
>>> sage: f
>>> x |--> sin_integral(x)
>>> sage: taylor(f(x),x,0,10)
>>> 73/466560*x^9 - 127/35280*x^7 + 31/600*x^5 - 7/18*x^3 + x
>>>
>>> The first weirdness is that Sage can't compute the integral unless I add
>>> the "assume(x>0)"; I'm not sure why.
>>>
>>> The second weirdness is that the Taylor series is wrong!
>>> Taylor(Si(x),x,0,10) gives the same answer.
>>>
>>> Fernando
>>>
>>>
>>> --
>>> ==================================================================
>>> Fernando Q. Gouvea
>>> Carter Professor of Mathematics
>>> Colby College
>>> Mayflower Hill 5836
>>> Waterville, ME 04901 fqgo...@colby.edu
>>> http://www.colby.edu/~fqgouvea
>>>
>>> The object of opening the mind, as of opening the mouth, is to shut it
>>> again on something solid.
>>> -- G. K. Chesterton, Autobiography.
>>>
>>>
>>> --
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