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| NumPy Baisc tutorial 3 - Python Programming |
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PROGRAM
1
import numpy as np
arr = np.arange(0,12,2)
print('Original array')
print(arr)
arr = arr.reshape(2,3)
print('Modified array 1')
print(arr)
for x in np.nditer(arr):
print (x)
print ('Transpose of the original array')
trans = arr.T
print (trans)
print ('Sorted in C-style order')
cstyle = trans.copy(order = 'C')
print (cstyle)
for x in np.nditer(cstyle):
print (x)
print ('Sorted in F-style order')
fstyle = trans.copy(order = 'F')
print (fstyle)
for x in np.nditer(fstyle):
print (x)
for x in np.nditer(arr, op_flags = ['readwrite']):
x[...] = 2*x
print ('Modified array 2')
print (arr)
OUTPUT
Original array
[ 0 2 4 6 8 10]
Modified array 1
[[ 0 2 4]
[ 6 8 10]]
0
2
4
6
8
10
Transpose of the original array
[[ 0 6]
[ 2 8]
[ 4 10]]
Sorted in C-style order
[[ 0 6]
[ 2 8]
[ 4 10]]
0
6
2
8
4
10
Sorted in F-style order
[[ 0 6]
[ 2 8]
[ 4 10]]
0
2
4
6
8
10
Modified array 2
[[ 0 4 8]
[12 16 20]]
PROGRAM
2
import numpy as np
arr = np.arange(0,12,2)
print('Original array')
print(arr)
arr = arr.reshape(2,3)
print ('Modified array F' )
for x in np.nditer(arr, flags = ['external_loop'], order = 'F'):
print (x)
print ('Modified array C' )
for x in np.nditer(arr, flags = ['external_loop'], order = 'C'):
print (x)
print ('Modified array C' )
for x in np.nditer(arr, flags = ['external_loop'], order = 'A'):
print (x)
print ('Modified array C' )
for x in np.nditer(arr, flags = ['external_loop'], order = 'K'):
print (x)
OUTPUT
Original array
[ 0 2 4 6 8 10]
Modified array F
[0 6]
[2 8]
[ 4 10]
Modified array C
[ 0 2 4 6 8 10]
Modified array C
[ 0 2 4 6 8 10]
Modified array C
[ 0 2 4 6 8 10]
PROGRAM
3
import numpy as np
arr = np.array([7.0,5.55, 1903, 0.568, 25.532,6.1,1.7])
print ('Original array')
print (arr)
print ('Rounding of digits')
print (np.around(arr) )
print (np.around(arr, decimals = 1) )
print (np.around(arr, decimals = -1))
print (np.around(arr, decimals = 2) )
print('Modified array after floor function')
print (np.floor(arr))
print('Modified array after ceil function')
print (np.ceil(arr))
OUTPUT
Original array
[7.0000e+00 5.5500e+00 1.9030e+03 5.6800e-01 2.5532e+01 6.1000e+00
1.7000e+00]
Rounding of digits
[7.000e+00 6.000e+00 1.903e+03 1.000e+00 2.600e+01 6.000e+00 2.000e+00]
[7.000e+00 5.600e+00 1.903e+03 6.000e-01 2.550e+01 6.100e+00 1.700e+00]
[ 10. 10. 1900. 0. 30.
10. 0.]
[7.000e+00 5.550e+00 1.903e+03 5.700e-01 2.553e+01 6.100e+00 1.700e+00]
Modified array after floor function
[7.000e+00 5.000e+00 1.903e+03 0.000e+00 2.500e+01 6.000e+00 1.000e+00]
Modified array after ceil function
[7.000e+00 6.000e+00 1.903e+03 1.000e+00 2.600e+01 7.000e+00 2.000e+00]
PROGRAM
4
import numpy as np
arr1 = np.arange(9, dtype = np.float_).reshape(3,3)
print ('array 1')
print (arr)
print ('array 2')
arr2 = np.array([10,20,30])
print(arr2)
print ('Addition')
print (np.add(arr1,arr2) )
print ('Subtraction')
print (np.subtract(arr1,arr2) )
print ('Multiplication')
print (np.multiply(arr1,arr2) )
print ('Division')
print (np.divide(arr1,arr2) )
OUTPUT
array 1
[7.0000e+00 5.5500e+00 1.9030e+03 5.6800e-01 2.5532e+01 6.1000e+00
1.7000e+00]
array 2
[10 20 30]
Addition
[[10. 21. 32.]
[13. 24. 35.]
[16. 27. 38.]]
Subtraction
[[-10. -19. -28.]
[ -7. -16. -25.]
[ -4. -13. -22.]]
Multiplication
[[ 0. 20. 60.]
[ 30. 80. 150.]
[ 60. 140. 240.]]
Division
[[0. 0.05
0.06666667]
[0.3 0.2
0.16666667]
[0.6 0.35
0.26666667]]
PROGRAM
5
import numpy as np
arr = np.array([10,100,1000])
print(arr)
print (' power function 1')
print (np.power(arr,2) )
print (' power function 2')
print (np.power(arr,3) )
OUTPUT
[ 10 100 1000]
power function
[ 100 10000 1000000]
power function
[ 1000 1000000 1000000000]
PROGRAM
6
import numpy as np
arr = np.array([-2.9j, 7.2j, 16. , 18+11j])
print ('Original array')
print (arr)
print ('real() function:')
print (np.real(arr))
print (' imag() function' )
print (np.imag(arr))
print ('conj() function:' )
print (np.conj(arr))
print (' angle() function' )
print (np.angle(arr))
print (' angle() function')
print (np.angle(arr, deg = True))
print (' angle() function')
print (np.angle(arr, deg = False))
OUTPUT
Original array
[-0. -2.9j 0. +7.2j 16. +0.j 18.+11.j ]
real() function:
[-0. 0. 16. 18.]
imag() function
[-2.9 7.2 0. 11. ]
conj() function:
[-0. +2.9j 0. -7.2j 16. -0.j 18.-11.j ]
angle() function
[-1.57079633 1.57079633 0.
0.5485494 ]
angle() function
[-90. 90.
0. 31.42956561]
angle() function
[-1.57079633 1.57079633 0.
0.5485494 ]