Universial function

🛻 universial function basics

universial function documents

import numpy as np

a1 = np.arange(30).reshape(5,6)
print(a1)

# result
# [[ 0  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]]

⌨️ np.add.reduce

np.add.reduce(a1, axis=1)
# result : [ 15  51  87 123 159]

np.add.reduce(a1, axis=1, where = a1%2==0)
# result : [ 6 24 42 60 78]

print(np.add.reduce(a1, axis = (0,1)))
# result : 435

⌨️ np.add.accumulate

np.add.accumulate(a1,axis=1)
# result
# [[  0   1   3   6  10  15]
   [  6  13  21  30  40  51]
   [ 12  25  39  54  70  87]
   [ 18  37  57  78 100 123]
   [ 24  49  75 102 130 159]]
   

⌨️ np.add.reduceat

잘 모르겠다.

⌨️ np.add.outer

a2 = np.arange(10)
a3 = np.arange(100,105)
print(a2, a2.shape)
print(a3, a3.shape)

# result
# [0 1 2 3 4 5 6 7 8 9] (10,)  -> a2
  [100 101 102 103 104] (5,)   -> a3

a4 = np.add.outer(a2,a3)
print(a4,a4.shape)

# result
# [[100 101 102 103 104]
   [101 102 103 104 105]
   [102 103 104 105 106]
   [103 104 105 106 107]
   [104 105 106 107 108]
   [105 106 107 108 109]
   [106 107 108 109 110]
   [107 108 109 110 111]
   [108 109 110 111 112]
   [109 110 111 112 113]] (10, 5)