There must be an easier way to do this. In a Python class I have a list of RealNumber elements, "fracs_list". I want to multiply them by a common scalar "length" and round them to get a vector of integers. I have tried many permutations of the following code, most of which fail. This works, but it's ugly!
answer = vector([Integer(int(round(frac*length))) for frac in fracs_list]) ipdb> type(self.var_fracs[0]) <type 'sage.rings.real_mpfr.RealNumber'> ipdb> type(length) <type 'sage.rings.integer.Integer'> ipdb> type(length * fracs_list[0]) <type 'sage.rings.real_mpfr.RealNumber'> ipdb> type(round(length * fracs_list[0])) <type 'float'> ipdb> Integer(round(length * fracs_list[0])) ipdb> answer = vector([round(frac*length) for frac in fracs_list]) *** TypeError: unable to find a common ring for all elements ipdb> answer = vector([int(round(frac*length)) for frac in fracs_list]) *** TypeError: unable to find a common ring for all elements ipdb> answer = vector([Integer(round(frac*length)) for frac in fracs_list]) *** TypeError: unable to coerce element to an integer ipdb> answer = vector(IntegerRing(), [round(frac*length) for frac in fracs_list]) *** TypeError: unable to coerce element to an integer Any suggestions on how to get this computation without less than the round and two type conversions? Thanks! --- Ryan Hinton [EMAIL PROTECTED] --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
