Check Whether Numpy Array Row Is Smaller Than The Next

Suppose i have the following array: In [1]: k Out[1]: array([[0], [1], [2], [7], [4], [5], [6]]) I would like to check whether each row

Solution 1:

You can also use np.diff along axis 0 and check whether the result is greater than 0.

arr = np.array([[0],
                [1],
                [2],
                [7],
                [4],
                [5],
                [6]])
np.diff(arr, axis=0) > 0

array([[ True],  1 > 0
       [ True],  2 > 1
       [ True],  7 > 2
       [False],  4 > 7
       [ True],  5 > 4
       [ True]]) 6 > 5

There is no row follow [6] and thus the result is one row shorter.

Solution 2:

The k[:+1,0] means "from 0 to +1", there is only one element. You need:

k[:-1, 0] < k[1:, 0]