#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
ENGG1811. 

Illustrating the diff function 
"""
import numpy as np 

# Problem parameters
array1 = np.array([ [-3,  0,  0,  5], 
                    [ 6, -4,  6,  7],
                    [ 3,  5,  2,  3]])


# diff 
print('diff along axis 0 is:')                      
print(np.diff(array1, axis = 0)) # along axis 0 

print()
print('diff along axis 1 is:')     
print(np.diff(array1, axis = 1)) # along axis 1