#Exer 5.7

import numpy as np

w = np.linspace(0,3,31)

"""
Slicing of lists and arrays:
w[start:stop:step], where start,stop,step and the last : are optional
"""

print('w[:] \n', w[:])
print('w[:-2] \n',w[:-2])
print('w[::5] \n',w[::5])
print('w[2:-2:6] \n',w[2:-2:6])

"""
Terminal> python slicing.py
w[:]
 [0.  0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.  1.1 1.2 1.3 1.4 1.5 1.6 1.7
 1.8 1.9 2.  2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3. ]
w[:-2]
 [0.  0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.  1.1 1.2 1.3 1.4 1.5 1.6 1.7
 1.8 1.9 2.  2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8]
w[::5]
 [0.  0.5 1.  1.5 2.  2.5 3. ]
w[2:-2:6]
 [0.2 0.8 1.4 2.  2.6]
"""