How do I do a rows swap of arrays using numpy?
I need this to implement the Gauss-Jordan method of partial pivotal linear systems.
How do I do a rows swap of arrays using numpy?
I need this to implement the Gauss-Jordan method of partial pivotal linear systems.
If by "swap" you mean transpose lines x columns, you do so:
import numpy as np
teste = np.array([i for i in range(1,41)]).reshape((10,4))
print('Normal:')
print(teste)
print('Transposta:')
print(teste.T)
Result:
Normal:
[[ 1 2 3 4]
[ 5 6 7 8]
[ 9 10 11 12]
[13 14 15 16]
[17 18 19 20]
[21 22 23 24]
[25 26 27 28]
[29 30 31 32]
[33 34 35 36]
[37 38 39 40]]
Transposta:
[[ 1 5 9 13 17 21 25 29 33 37]
[ 2 6 10 14 18 22 26 30 34 38]
[ 3 7 11 15 19 23 27 31 35 39]
[ 4 8 12 16 20 24 28 32 36 40]]
If, on the other hand, you mean to "trade" one line for the other, then you do it like this:
import numpy as np
teste = np.array([i for i in range(1,41)]).reshape((10,4))
print('Normal:')
print(teste)
print('Permutada:')
salva = np.copy(teste[1])
teste[1] = teste[5]
teste[5] = salva
print(teste)
Result:
Normal:
[[ 1 2 3 4]
[ 5 6 7 8]
[ 9 10 11 12]
[13 14 15 16]
[17 18 19 20]
[21 22 23 24]
[25 26 27 28]
[29 30 31 32]
[33 34 35 36]
[37 38 39 40]]
Permutada:
[[ 1 2 3 4]
[21 22 23 24]
[ 9 10 11 12]
[13 14 15 16]
[17 18 19 20]
[ 5 6 7 8]
[25 26 27 28]
[29 30 31 32]
[33 34 35 36]
[37 38 39 40]]