dask.array.allclose¶
- dask.array.allclose(arr1, arr2, rtol=1e-05, atol=1e-08, equal_nan=False)[source]¶
Returns True if two arrays are element-wise equal within a tolerance.
This docstring was copied from numpy.allclose.
Some inconsistencies with the Dask version may exist.
The tolerance values are positive, typically very small numbers. The relative difference (rtol * abs(b)) and the absolute difference atol are added together to compare against the absolute difference between a and b.
NaNs are treated as equal if they are in the same place and if
equal_nan=True
. Infs are treated as equal if they are in the same place and of the same sign in both arrays.- Parameters
- a, barray_like
Input arrays to compare.
- rtolfloat
The relative tolerance parameter (see Notes).
- atolfloat
The absolute tolerance parameter (see Notes).
- equal_nanbool
Whether to compare NaN’s as equal. If True, NaN’s in a will be considered equal to NaN’s in b in the output array.
New in version 1.10.0.
- Returns
- allclosebool
Returns True if the two arrays are equal within the given tolerance; False otherwise.
Notes
If the following equation is element-wise True, then allclose returns True.
absolute(a - b) <= (atol + rtol * absolute(b))
The above equation is not symmetric in a and b, so that
allclose(a, b)
might be different fromallclose(b, a)
in some rare cases.The comparison of a and b uses standard broadcasting, which means that a and b need not have the same shape in order for
allclose(a, b)
to evaluate to True. The same is true for equal but not array_equal.allclose is not defined for non-numeric data types.
Examples
>>> np.allclose([1e10,1e-7], [1.00001e10,1e-8]) False >>> np.allclose([1e10,1e-8], [1.00001e10,1e-9]) True >>> np.allclose([1e10,1e-8], [1.0001e10,1e-9]) False >>> np.allclose([1.0, np.nan], [1.0, np.nan]) False >>> np.allclose([1.0, np.nan], [1.0, np.nan], equal_nan=True) True