numpy_arange.py

import numpy as np

# arrange(stop)
x = np.arange(5)
# x → array([0, 1, 2, 3, 4])


# arrange(start, stop)
y = np.arange(5, 10)
# y → array([5, 6, 7, 8, 9])


# arrange(start, stop, step)
z = np.arange(10, 20, 3)
# z → array([10, 13, 16, 19])


# arange(stop, step=step)
x = np.arange(10, step=2)
# x → array([0, 2, 4, 6, 8])


# stop < start
x = np.arange(start=10, stop=9)
# array([], dtype=int32)


# arangeとlinspaceの違い
x = np.arange(0, 100, 25)
# x → array([ 0, 10, 20, 30, 40, 50, 60, 70, 80, 90])

y = np.linspace(0, 100, 10)
# y → array([  0.        ,  11.11111111,  22.22222222,  33.33333333,
#             44.44444444,  55.55555556,  66.66666667,  77.77777778,
#             88.88888889, 100.        ])


# arangeとlinspaceの違い（最小限の引数）
x = np.arange(0, 50)
# x → array([ 0,  1,  2,  3,..., 49]) #1ずつ増える

y = np.linspace(0, 10)
# y → array([ 0.        ,  0.20408163,  0.40816327,..., 10.]) #50要素