ufunc Differences

Differences

A discrete difference means subtracting two successive elements.

E.g. for [1, 2, 3, 4], the discrete difference would be [2-1, 3-2, 4-3] = [1, 1, 1]

To find the discrete difference, use the diff() function.

Example

  import numpy as np

arr = np.array([10,
  15, 25, 5])

newarr = np.diff(arr)

print(newarr)

Note: Returns: [5 10 -20] because 15-10=5, 25-15=10, and 5-25=-20

We can perform this operation repeatedly by giving parameter n.

Example

  import numpy as np

arr = np.array([10,
  15, 25, 5])

newarr = np.diff(arr, n=2)

print(newarr)

Note: Returns: [5 -30] because: 15-10=5, 25-15=10, and 5-25=-20 AND 10-5=5 and -20-10=-30