On Dec 2, 2008, at 6:12 PM, ggrafendorfer wrote: > Hi Robert >> symbolic expression "i^2" is getting turned into CDF(i)^CDF(2). > > the i^2 should also be of type CDF, but > > sage: type(i^2) > <class 'sage.calculus.calculus.SymbolicArithmetic'>
Ah, I think I see the misunderstanding now. i^2 should not be of type CDF, because i is not of type CDF. (Well, technically, one cares more about parents than types). CDF.0 or CDF.gen(0) is the "complex double" imaginary unit. Symbolic Ring sage: parent(i) Symbolic Ring sage: parent(i^2) Symbolic Ring sage: CDF.0 1.0*I sage: parent(CDF.0) Complex Double Field sage: parent(CDF.0^2) Complex Double Field Generally in Sage we prefer exact arithmetic to numeric approximations, because once you start doing numeric things one has to deal with rounding errors, etc. and there's no going back. - Robert --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
