# -*- coding: utf-8 -*-
"""

Test av to ulike metoder for listeutvidelse med ett element

Finn Aakre Haugen (finn.haugen@usn.no)
University of South-Eastern Norway
2019 06 10

"""

# ----------------------------------------------------------

import numpy as np
import time

# ----------------------------------------------------------

N = 100000
dyn_array = np.array([])
preallok_array = np.zeros(N)

# ----------------------------------------------------------
# append:

tic = time.time()

for k in range(0, N):
    dyn_array = np.append(dyn_array, 10*k)

toc = time.time()
t_elapsed_append = toc - tic

# ----------------------------------------------------------
# preallok:

tic = time.time()

for k in range(0, N):
    preallok_array[k] = 10*k

toc = time.time()
t_elapsed_preallok = toc - tic

# ----------------------------------------------------------
# Sammenlikning:

forhold_append_preallok = t_elapsed_append/t_elapsed_preallok

print('------------------------------------------------')
print('N =', N)
#print('t_elapsed_append [s] = {:.5f}'.format(t_elapsed_append))
#print('t_elapsed_preallok [s] = {:.5f}'.format(t_elapsed_preallok))
#print('t_elapsed_append/t_elapsed_preallok = {:.5f}'.format(forhold_append_preallok))
print('t_elapsed_append [s] = ',t_elapsed_append)
print('t_elapsed_preallok [s] =', t_elapsed_preallok)
print('t_elapsed_append/t_elapsed_preallok =', forhold_append_preallok)
print('------------------------------------------------')