NumPy : Beginner's Guide - Third Edition

Time for action – checking the array order

Let's check whether one array is strictly greater than another array:

1. Call the assert_array_less() function with two strictly ordered arrays:

   print("Pass", np.testing.assert_array_less([0, 0.123456789, np.nan], [1, 0.23456780, np.nan]))

   The result is as follows:

   Pass None
   

2. Call the assert_array_less() function:

   print("Fail", np.testing.assert_array_less([0, 0.123456789, np.nan], [0, 0.123456780, np.nan]))

   The test raises an exception:

   Fail
   Traceback (most recent call last):
     ...
       raise AssertionError(msg)
   AssertionError:
   Arrays are not less-ordered
   
   (mismatch 100.0%)
    x: array([ 0.        ,  0.12345679,         nan])
    y: array([ 0.        ,  0.12345678,         nan])
   

What just happened?

We checked the ordering of two arrays with the assert_array_less() ...