Such a domain exists and is called UnivariateFormalPowerSeries :-) ra...@hemmecke.org schrieb am Montag, 22. Februar 2021 um 18:41:06 UTC+1:
> Oops... attachments are now there... > > > -------- Forwarded Message -------- > Subject: UnivariateTaylorSeries > Date: Mon, 22 Feb 2021 18:38:49 +0100 > From: Ralf Hemmecke <ra...@hemmecke.org> > To: fricas-devel <fricas...@googlegroups.com> > > Hello, > > I wrote some code that relies on univariate taylor series in q. > Since it was cumbersome to always carry the variable name 'q and the > center of expansion 0 in the type, I created a kind of wrapper domain. > (See attachement for something that demonstrates my problem.) > > My wrapper domain actually works nicely as long as I do not want to make > a connection back and forth to UnivariateTaylorSeries. > > My question is how can I coerce an element of QEtaTaylorSeries(Q) to an > element of UnivariateTaylorSeries(Q, 'q, 0$Q) and/or the other way round? > > I simply cannot find the error in the implementation. > > I am sure it has something to do with non-type-valued arguments, but how > can I make this code work nicely without tricks? > > Thank you > Ralf > > ========================================================== > > (7) -> t1 - t2 > There are 9 exposed and 6 unexposed library operations named - > having 2 argument(s) but none was determined to be applicable. > Use HyperDoc Browse, or issue > )display op - > to learn more about the available operations. Perhaps > package-calling the operation or using coercions on the arguments > will allow you to apply the operation. > > Cannot find a definition or applicable library operation named - > with argument type(s) > UnivariateTaylorSeries(Fraction(Integer),q,0) > QEtaTaylorSeries(Fraction(Integer)) > > Perhaps you should use "@" to indicate the required return type, > or "$" to specify which version of the function you need. > > (7) -> t1 :: QTS(Q) > > Cannot convert the value from type UnivariateTaylorSeries(Fraction( > Integer),q,0) to QEtaTaylorSeries(Fraction(Integer)) . > > (7) -> t2 :: UTS(Q) > > Cannot convert the value from type QEtaTaylorSeries(Fraction(Integer > )) to UnivariateTaylorSeries(Fraction(Integer),q,0) . > > (7) -> coerce(t1)$QTS(Q) > There are 81 exposed and 159 unexposed library operations named > coerce having 1 argument(s) but none was determined to be > applicable. Use HyperDoc Browse, or issue > )display op coerce > to learn more about the available operations. Perhaps > package-calling the operation or using coercions on the arguments > will allow you to apply the operation. > > Cannot find a definition or applicable library operation named > coerce with argument type(s) > UnivariateTaylorSeries(Fraction(Integer),q,0) > > Perhaps you should use "@" to indicate the required return type, > or "$" to specify which version of the function you need. > > -- You received this message because you are subscribed to the Google Groups "FriCAS - computer algebra system" group. To unsubscribe from this group and stop receiving emails from it, send an email to fricas-devel+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/fricas-devel/a2dfc27f-751f-43fe-80b9-615df408fe9dn%40googlegroups.com.
