Creating a NumPy Array

Creating a NumPy Array

1. Basic ndarray
2. Array of zeros
3. Array of ones
4. Random numbers in ndarray
5. An array of your choice
6. Imatrix in NumPy
7. Evenly spaced ndarray

Program

import numpy as np

#Creating basic array
ary = np.array([[2,4,6,8,10],[1,3,5,7,9]],ndmin=2)
print("Two-Dimensional Array is:")
print(ary)

#Array of Zeros
allZeros = np.zeros([3,3],dtype=int)
print("Array with only zero's:")
print(allZeros)

#Array of Ones
allOnes = np.ones([7],dtype=int)
print("Array with only one's:")
print(allOnes)

#Random numbers in ndarray
aryRand = np.ndarray(shape=(2,2))
print("Array with random numbers:")
print(aryRand)

#An Array of User Choice
n = int(input("Enter number of elements: "))
ary = np.array([],dtype=int)
print("Enter %d elements:"%(n))
for i in range(n):
    ary = np.append(ary,int(input()))
print("Array is:")
print(ary)

#Matrix in NumPy
mtrx = np.matrix(([1, 2, 3],[4, 5, 6]))
print("Matrix is:")
print(mtrx)
imtrx = mtrx.getI()
print("Imatrix of given matrix:")
print(imtrx)

#Evenly Spaced ndarray
evenlySpacedAry = np.linspace(20,30,num=4,dtype=int)
print("Evenly Spaced Array is:")
print(evenlySpacedAry)

Output

Two-Dimensional Array is:
[[ 2 4 6 8 10]
[ 1 3 5 7 9]]
Array with only zero's:
[[0 0 0]
[0 0 0]
[0 0 0]]
Array with only one's:
[1 1 1 1 1 1 1]
Array with random numbers:
[[6.01334515e-154 2.18176648e+243]
[7.68290838e+170 4.88257229e+199]]
Enter number of elements: 3
Enter 3 elements:
7
5
9
Array is:
[7 5 9]
Matrix is:
[[1 2 3]
[4 5 6]]
Imatrix of given matrix:
[[-0.94444444 0.44444444]
[-0.11111111 0.11111111]
[ 0.72222222 -0.22222222]]
Evenly Spaced Array is:
[20 23 26 30]