Misc

import numpy as np

# Values from 5 to 20
a = np.arange(5, 20)

print(a)

[ 5  6  7  8  9 10 11 12 13 14 15 16 17 18 19]

type(a)

numpy.ndarray

# Revere an array
b = a[::-1]

b

array([19, 18, 17, 16, 15, 14, 13, 12, 11, 10,  9,  8,  7,  6,  5])

c = np.array([[2, 3], [5, 89]])

d = c[::-1]

print(c)

[[ 2  3]
 [ 5 89]]

print(d)

[[ 5 89]
 [ 2  3]]

e = np.eye(5)

print(e)

[[1. 0. 0. 0. 0.]
 [0. 1. 0. 0. 0.]
 [0. 0. 1. 0. 0.]
 [0. 0. 0. 1. 0.]
 [0. 0. 0. 0. 1.]]

# Random
f = np.random.random((3, 1))

print(f)

[[0.57782685]
 [0.13940557]
 [0.01241673]]

g = np.ones((4, 4))

print(g)

[[1. 1. 1. 1.]
 [1. 1. 1. 1.]
 [1. 1. 1. 1.]
 [1. 1. 1. 1.]]

i = np.pad(g, pad_width=3, mode='constant')

print(i)

[[0. 0. 0. 0. 0. 0. 0. 0. 0. 0.]
 [0. 0. 0. 0. 0. 0. 0. 0. 0. 0.]
 [0. 0. 0. 0. 0. 0. 0. 0. 0. 0.]
 [0. 0. 0. 1. 1. 1. 1. 0. 0. 0.]
 [0. 0. 0. 1. 1. 1. 1. 0. 0. 0.]
 [0. 0. 0. 1. 1. 1. 1. 0. 0. 0.]
 [0. 0. 0. 1. 1. 1. 1. 0. 0. 0.]
 [0. 0. 0. 0. 0. 0. 0. 0. 0. 0.]
 [0. 0. 0. 0. 0. 0. 0. 0. 0. 0.]
 [0. 0. 0. 0. 0. 0. 0. 0. 0. 0.]]

j = np.pad(g, pad_width=1, mode='constant', constant_values=2)

print(j)

[[2. 2. 2. 2. 2. 2.]
 [2. 1. 1. 1. 1. 2.]
 [2. 1. 1. 1. 1. 2.]
 [2. 1. 1. 1. 1. 2.]
 [2. 1. 1. 1. 1. 2.]
 [2. 2. 2. 2. 2. 2.]]

k = np.random.random(10)

print(k)

[0.90819857 0.85455489 0.28167892 0.88489143 0.54545762 0.15966174
 0.29479419 0.80940438 0.78830577 0.56276551]

# Array Sorting
k.sort()

print(k)

[0.07001264 0.13921812 0.47192512 0.57821869 0.64253229 0.68100415
 0.68742275 0.69785331 0.8750189  0.94492613]