Mercurial > cpython-lru_cache-weakref
diff Modules/mathmodule.c @ 48102:b35ce954a392 legacy-trunk
Replace math.sum with math.fsum in a couple of comments
that were missed by r65308
| author | Mark Dickinson <dickinsm@gmail.com> |
|---|---|
| date | Wed, 30 Jul 2008 16:25:16 +0000 |
| parents | 8d05dda735f8 |
| children | 776a6cafc21a |
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--- a/Modules/mathmodule.c Wed Jul 30 16:20:10 2008 +0000 +++ b/Modules/mathmodule.c Wed Jul 30 16:25:16 2008 +0000 @@ -341,7 +341,7 @@ Note 4: A similar implementation is in Modules/cmathmodule.c. Be sure to update both when making changes. - Note 5: The signature of math.sum() differs from __builtin__.sum() + Note 5: The signature of math.fsum() differs from __builtin__.sum() because the start argument doesn't make sense in the context of accurate summation. Since the partials table is collapsed before returning a result, sum(seq2, start=sum(seq1)) may not equal the @@ -506,7 +506,7 @@ Needed so that sum([1e-16, 1, 1e16]) will round-up the last digit to two instead of down to zero (the 1e-16 makes the 1 slightly closer to two). With a potential 1 ULP rounding - error fixed-up, math.sum() can guarantee commutativity. */ + error fixed-up, math.fsum() can guarantee commutativity. */ if (n > 0 && ((lo < 0.0 && p[n-1] < 0.0) || (lo > 0.0 && p[n-1] > 0.0))) { y = lo * 2.0;