Two more issues for ZZ: Duplicate methods:
n.prime_factors and n.prime_divisors do precisely the same thing and have the same docstring, even down to one of the docstrings having examples for the wrong function. Missing methods: n.number_of_divisors (note one does not need to compute the divisors to compute this function) Bill. On 8 Apr, 07:17, Bill Hart <goodwillh...@googlemail.com> wrote: > I've been looking through the methods for ZZ with a view to doing a > Magma/Sage comparison for marketing purposes. I've been noticing a few > issues as I go. There's going to be lots of these, so I think I should > give my list in small blocks. I can file trac tickets for them once > someone verifies that these are really not just me not knowing enough > python, or whatever. > > ZZ > ==== > > Speed Issues: > > * n.bits takes much longer than n.binary(), but the latter needs to > compute the former first!!! > * n.coprime_integers uses a hopelessly slow algorithm (we should at > least use a sieve) > * n.factor is bizarrely slow for small integers (e.g. n < 1,000,000) > by a HUGE factor > * n.exact_log can be done faster for small bases by making careful use > of the identity log_m(n) = log_2(n)/log_2(m) (I wrote a crappy broken > python implementation and timed this - I don't know how to write it > properly as I don't know enough about Sage yet) > > Missing doc strings: > > * n.base_extend > * n.additive_order > * n.category > * n.db (doesn't give an example) > * n.degree > > Missing methods: > > * n.euler_phi > * n.random (random integer less than n - I will believe you if you > tell me this is not the python way) > > Weird names: > > * n.divide_knowing_divisible_by (perhaps div_exact, exact_quotient, > divide_exact would be better) > > Documentation issues: > > * n.dump says "Same as self.save(filename, compress)", but compress is > not discussed in save docstring > > Bill. --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to sage-devel-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
