История изменений

Исправление grem, 16.03.18 20:35 (текущая версия) :

import numpy as np

a = np.array([(1,2), (3,4)], dtype={'names':['a','b'], 'formats': ['f8', 'f8']})
print("a:\n", a)

print("a.view:\n", a.view((a.dtype[0], len(a.dtype.names))) )

print("2 * a:\n", np.dot(2, a.view((a.dtype[0], len(a.dtype.names)))) )

вывод

a:
 [(1.0, 2.0) (3.0, 4.0)]
a.view:
 [[ 1.  2.]
 [ 3.  4.]]
2 * a:
 [[ 2.  4.]
 [ 6.  8.]]

Исходная версия grem, 16.03.18 20:31:

import numpy as np

a = np.array([(1,2), (3,4)], dtype={'names':['a','b'], 'formats': ['f8', 'f8']})
print("a:\n", a)

print("a.view:\n", a.view((a.dtype[0], len(a.dtype.names))) )

b = 2 * np.ones((2, 2))
print("b:\n", b)

print("b * a:\n", np.dot(b, a.view((a.dtype[0], len(a.dtype.names)))) )

вывод

a:
 [(1.0, 2.0) (3.0, 4.0)]
a.view:
 [[ 1.  2.]
 [ 3.  4.]]
b:
 [[ 2.  2.]
 [ 2.  2.]]
b * a:
 [[  8.  12.]
 [  8.  12.]]