I don't use crt very often and I can't speak to the usefulness of this function, but it does seem odd to me that crt() has mod as the first argument. I would expect it to be the second argument.
Aaron Meurer On Wed, Jan 22, 2020 at 2:19 PM Chris Smith <[email protected]> wrote: > > There are several APIs for crt-like functions as described in the `crt` > docstring: > > crt(mod, rem) > gf_crt(rem, mod) > solve_congruence(*rem_mod_pairs) > > > There is a new function, `crt_cartesian` being introduced by this PR. e.g. > > >>> from sympy.ntheory.modular import crt_cartesian > >>> from sympy.utilities.iterables import cartes > >>> rem = [[3, 5], [3, 7]] > >>> crt_cartesian(rem, [7, 11]) > [3, 73, 47, 40] > >>> [(p%7, p%11) for p in _] > [(3, 3), (3, 7), (5, 3), (5, 7)] > >>> assert _ == list(cartes(*rem)) > > > > Does anyone use such a calculation? Should the API of the new function be the > same as `crt`? reversed? a dictionary of `{modulus m: list of residuals wrt > modulus m}`? Should the output include the product of `mod` like crt does? > > -- > You received this message because you are subscribed to the Google Groups > "sympy" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sympy/b1f77e73-1fd5-4338-9776-beaf99be4bde%40googlegroups.com. -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/CAKgW%3D6K9616EYPVBaV%2BR%3Dji4LbykSm8cdgtOjva4XabuhSpT_w%40mail.gmail.com.
