This is the second example I have come across where I couldn't find a function because it didn't have a name, "only" a functional form using brackets().
The other one was polynomial evaluation (substitution), for example R=QQ[x] f=x^2+3 f(10) ## =103 -- in this case as soon as I mentioned it to William he implemented an equivalent f.subs(10) syntax which can at least be found using tab-completion. In Justin's example, could he have found the PSR(list) construction from tab-completion? I don't think so. How can we make the existence of these (neat, clever) tricks more visible to the user? John On 8/12/07, Justin C. Walker <[EMAIL PROTECTED]> wrote: > > > On Aug 12, 2007, at 14:38 , William Stein wrote: > > > > > On 8/12/07, Justin C. Walker <[EMAIL PROTECTED]> wrote: > >> Hi, all, > >> > >> A question: I have a batch of lists of ring elements that I'd like to > >> turn into either polynomials or power series, a la > >> > >> sage: PSR.<t>=PowerSeriesRing(QQ) > >> sage: f = PowerSeries(PSR,[a,b,c]) > >> > >> There doesn't seem to be a way to do this, other than the obvious. > >> Does it make sense to support such coercion, or should one just bite > >> the editor and code it as needed? > > > > I'm not sure what you're asking, but what's wrong with this? > > > > sage: PSR.<t>=PowerSeriesRing(QQ) > > sage: PSR([1,2,3]) > > 1 + 2*t + 3*t^2 > > > > I.e., coercion of lists to power series is built in already. > > Well, frankly, there is nothing wrong with that. In fact, it's what > I want. I will have to figure out what I did to convince myself that > it didn't work. > > Thanks! > > Justin > > -- > Justin C. Walker, Curmudgeon-At-Large > Institute for the Enhancement of the Director's Income > -------- > When LuteFisk is outlawed, > Only outlaws will have LuteFisk > -------- > > > > > > > -- John Cremona --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to [email protected] To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-forum URLs: http://sage.math.washington.edu/sage/ and http://sage.scipy.org/sage/ -~----------~----~----~----~------~----~------~--~---
