diff options
Diffstat (limited to 'numpy/core/fromnumeric.py')
| -rw-r--r-- | numpy/core/fromnumeric.py | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/numpy/core/fromnumeric.py b/numpy/core/fromnumeric.py index 422ebe2de..140056432 100644 --- a/numpy/core/fromnumeric.py +++ b/numpy/core/fromnumeric.py @@ -3129,11 +3129,10 @@ def around(a, decimals=0, out=None): ``np.around`` uses a fast but sometimes inexact algorithm to round floating-point datatypes. For positive `decimals` it is equivalent to - ``np.true_divide(np.rint(a * 10**decimals), 10**decimals)``, which is - inexact for large floating-point values or large values of `decimals` due - the inexact representation of decimal fractions in the IEEE floating point - standard [1]_ and errors introduced when scaling by powers of ten. For - instance, note the extra "1" in the following: + ``np.true_divide(np.rint(a * 10**decimals), 10**decimals)``, which has + error due to the inexact representation of decimal fractions in the IEEE + floating point standard [1]_ and errors introduced when scaling by powers + of ten. For instance, note the extra "1" in the following: >>> np.round(56294995342131.5, 3) 56294995342131.51 @@ -3154,6 +3153,9 @@ def around(a, decimals=0, out=None): >>> round(56294995342131.5, 3) 56294995342131.5 + >>> np.round(16.055, 2), round(16.055, 2) # equals 16.0549999999999997 + (16.06, 16.05) + References ---------- |