numpy.testing.assert_almost_equal()

numpy.testing.assert_almost_equal(actual, desired, decimal=7, err_msg='', verbose=True) [source]

Raises an AssertionError if two items are not equal up to desired precision.

Note

It is recommended to use one of assert_allclose, assert_array_almost_equal_nulp or assert_array_max_ulp instead of this function for more consistent floating point comparisons.

The test is equivalent to abs(desired-actual) < 0.5 * 10**(-decimal).

Given two objects (numbers or ndarrays), check that all elements of these objects are almost equal. An exception is raised at conflicting values. For ndarrays this delegates to assert_array_almost_equal

Parameters:

Parameters:	actual : array_like The object to check. desired : array_like The expected object. decimal : int, optional Desired precision, default is 7. err_msg : str, optional The error message to be printed in case of failure. verbose : bool, optional If True, the conflicting values are appended to the error message.
Raises:	AssertionError If actual and desired are not equal up to specified precision.

actual : array_like

The object to check.

desired : array_like

The expected object.

decimal : int, optional

Desired precision, default is 7.

err_msg : str, optional

The error message to be printed in case of failure.

verbose : bool, optional

If True, the conflicting values are appended to the error message.

Raises:

AssertionError

If actual and desired are not equal up to specified precision.

Examples

>>> import numpy.testing as npt
>>> npt.assert_almost_equal(2.3333333333333, 2.33333334)
>>> npt.assert_almost_equal(2.3333333333333, 2.33333334, decimal=10)
...
<type 'exceptions.AssertionError'>:
Items are not equal:
 ACTUAL: 2.3333333333333002
 DESIRED: 2.3333333399999998

>>> npt.assert_almost_equal(np.array([1.0,2.3333333333333]),
...                         np.array([1.0,2.33333334]), decimal=9)
...
<type 'exceptions.AssertionError'>:
Arrays are not almost equal
 
(mismatch 50.0%)
 x: array([ 1.        ,  2.33333333])
 y: array([ 1.        ,  2.33333334])

Links:

https://docs.scipy.org/doc/numpy-1.11.0/reference/generated/numpy.testing.assert_almost_equal.html

doc_NumPy

2025-01-10 15:47:30

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