回答編集履歴
3
追記
test
CHANGED
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@@ -79,3 +79,57 @@
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79
79
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print(argmax_2dim(a))
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80
80
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81
81
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```
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82
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+
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83
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+
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84
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+
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85
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+
皆さん『複数最大値がある場合』について言及されているので、便乗してみる。
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86
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+
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87
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+
```Python
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88
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+
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89
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+
def flatten_2dim(array):
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90
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+
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91
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+
return [item for sublist in array for item in sublist]
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92
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+
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93
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+
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94
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+
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95
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+
def all_argmax_2dim(array):
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96
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+
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97
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+
flat_array = flatten_2dim(array)
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98
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+
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99
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+
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100
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+
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101
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+
row_num = len(array)
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|
102
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+
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103
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+
max_value = max(flat_array)
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104
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+
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105
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+
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106
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+
|
|
107
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+
for i, elem in enumerate(flat_array):
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108
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+
|
|
109
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+
if elem == max_value:
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110
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+
|
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111
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+
yield i // row_num, i % row_num
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112
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+
|
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113
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+
|
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114
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+
|
|
115
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+
a = [[0,5,5],[2,2,5],[5,1,3]]
|
|
116
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+
|
|
117
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+
for argmax in all_argmax_2dim(a):
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118
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+
|
|
119
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+
print(argmax)
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|
120
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+
|
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121
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+
|
|
122
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+
|
|
123
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+
"""出力
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124
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+
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125
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+
(0, 1)
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126
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+
|
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127
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+
(0, 2)
|
|
128
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+
|
|
129
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+
(1, 2)
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|
130
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+
|
|
131
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+
(2, 0)
|
|
132
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+
|
|
133
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+
"""
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|
134
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+
|
|
135
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+
```
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2
こっそりバグ修正
test
CHANGED
|
@@ -66,7 +66,7 @@
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66
66
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67
67
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row_num = len(array)
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68
68
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|
69
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-
max_index = max(flat_array)
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69
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+
max_index = flat_array.index(max(flat_array))
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70
70
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71
71
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72
72
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1
追記
test
CHANGED
|
@@ -43,3 +43,39 @@
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43
43
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44
44
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45
45
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ラムダ式がわかるならそのまま使った方が簡潔でしょう。
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46
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+
|
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47
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+
|
|
48
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+
|
|
49
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+
---
|
|
50
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+
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|
51
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+
どうしてもnumpyを使いたくない場合。
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52
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+
|
|
53
|
+
```Python
|
|
54
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+
|
|
55
|
+
def flatten_2dim(array):
|
|
56
|
+
|
|
57
|
+
return [item for sublist in array for item in sublist]
|
|
58
|
+
|
|
59
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+
|
|
60
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+
|
|
61
|
+
def argmax_2dim(array):
|
|
62
|
+
|
|
63
|
+
flat_array = flatten_2dim(array)
|
|
64
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+
|
|
65
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+
|
|
66
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+
|
|
67
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+
row_num = len(array)
|
|
68
|
+
|
|
69
|
+
max_index = max(flat_array)
|
|
70
|
+
|
|
71
|
+
|
|
72
|
+
|
|
73
|
+
return max_index // row_num, max_index % row_num
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|
74
|
+
|
|
75
|
+
|
|
76
|
+
|
|
77
|
+
a = [[0,1,1],[2,2,5],[2,1,3]]
|
|
78
|
+
|
|
79
|
+
print(argmax_2dim(a))
|
|
80
|
+
|
|
81
|
+
```
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