numpy.argmax(array，axis = None，out = None)：返回特定軸上數組max元素的索引。
參數：
array:Input array to work on
axis :[int, optional]Along a specified axis like 0 or 1
out :[array optional]Provides a feature to insert output to the out
array and it should be of appropriate shape and dtype
返回：
Array of indices into the array with same shape as array.shape with the dimension along axis removed.
代碼1：
# Python Program illustrating
# working of argmax()
import numpy as geek
# Working on 2D array
array = geek.arange(12).reshape(3, 4)
print("INPUT ARRAY:\n", array)
# No axis mentioned, so works on entire array
print("\nMax element:", geek.argmax(array))
# returning Indices of the max element
# as per the indices
print("\nIndices of Max element:", geek.argmax(array, axis=0))
print("\nIndices of Max element:", geek.argmax(array, axis=1))輸出：
INPUT ARRAY: [[ 0 1 2 3] [ 4 5 6 7] [ 8 9 10 11]] Max element: 11 Indices of Max element: [2 2 2 2] Indices of Max element: [3 3 3]
代碼2：
# Python Program illustarting
# working of argmax()
import numpy as geek
# Working on 2D array
array = geek.random.randint(16, size=(4, 4))
print("INPUT ARRAY:\n", array)
# No axis mentioned, so works on entire array
print("\nMax element:", geek.argmax(array))
# returning Indices of the max element
# as per the indices
'''
[[ 0 3 8 13]
[12 11 2 11]
[ 5 13 8 3]
[12 15 3 4]]
^ ^ ^ ^
12 15 8 13 - element
1 3 0 0 - indices
'''
print("\nIndices of Max element:", geek.argmax(array, axis = 0))
'''
ELEMENT INDEX
->[[ 0 3 8 13] 13 3
->[12 11 2 11] 12 0
->[ 5 13 8 3] 13 1
->[12 15 3 4]] 15 1
'''
print("\nIndices of Max element:", geek.argmax(array, axis = 1))輸出：
INPUT ARRAY: [[ 0 3 8 13] [12 11 2 11] [ 5 13 8 3] [12 15 3 4]] Max element: 15 Indices of Max element: [1 3 0 0] Indices of Max element: [3 0 1 1]
代碼3：
# Python Program illustarting
# working of argmax()
import numpy as geek
# Working on 2D array
array = geek.arange(10).reshape(2, 5)
print("array:\n", array)
array[0][1] = 6
print("\narray:\n", array)
# Returns max element
print("\narray:", geek.argmax(array))
# First occurrence of an max element is given
print("\nMAX ELEMENT INDICES:", geek.argmax(array, axis = 0))輸出：
array: [[0 1 2 3 4] [5 6 7 8 9]] array: [[0 6 2 3 4] [5 6 7 8 9]] array: 9 MAX ELEMENT INDICES: [1 0 1 1 1]
參考文獻：
https://docs.scipy.org/doc/numpy-dev/reference/generated/numpy.argmax.html#numpy.argmax
相關用法
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