Le 05/03/2019 à 19:53, Nils Bruin a écrit :
On Tuesday, March 5, 2019 at 10:27:47 AM UTC-8, vdelecroix wrote:
Just to give some elements of comparison. Following the specifications
of the standard math library in C what MPFR [3] does is that
- "floor", "ceil", "round", "trunc" are the standard rounding
functions to some integer in their mathematical definition (ie
independently of the rounding mode)
Yes, I think this is an important point. We should not deviate from that.
I am fine having extra argument to floor, ceil, round, trunc in
sage to ask for bits after the decimal point. But I would keep
carefully the above specifications.
I don't think we should have an extra argument. floor, ceil, round, and
trunc are maps from floats to integers. Rounding with extra digits after
the (decimal?) point would require a change in return type. Changing
representation length of a float is a different operation than converting
it to an integer.
Technically speaking no since the C math library returns double
(the answer might not fit in a long anyway) and MPFR similarly.
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