如何有效地将值“提升”到3d数组中的NaN位置？

分类：编程问答

如何解决如何有效地将值“提升”到3d数组中的NaN位置？

我有一个嵌套列表的数据集，它们的长度都相同（大于120）。我只需要最新的120个有效值。 （因此，就像逐行将NaN值向上移动到末尾，然后选择最后一个120 是这样做的一种方法。）

如何有效地做到这一点？ （因为我有数百万个此类样本）

[# Samples list
 [ # Sample 1
  [ 89.319787 1.329743 99.234670 ... 52.329743 0.319787 2.319787 ] 
  [ 84.319787 1.329743 49.329743 ... 52.329743    0.319 2.319787 ] 
  [ 12.319787      NaN 33.329743 ... 52.329743 0.319787 2.319787 ] 
  [ 33.319787 1.329743 23.329743 ... 52.329743 0.319787 2.319787 ] 
  ... 
  [ 23.319787 1.329743 45.234670 ... 52.329743  0.32721 2.319787 ] 
  [ 89.319787      NaN 99.234670 ...       NaN      NaN 2.319787 ] 
  [ 84.319787 1.329743 49.329743 ... 52.329743    0.319 2.319787 ] 
  [ 12.319787 1.329743       NaN ... 52.329743 0.319787 2.319787 ] 
  [ 33.319787 1.329743       NaN ... 52.329743      NaN 2.319787 ] 
                                                                  ],[ # Sample 2
  [ 89.319787 1.329743 99.234670 ... 52.329743 0.319787 2.319787 ] 
  [ 84.319787 1.329743 49.329743 ... 52.329743    0.319 2.319787 ] 
  [ 12.319787      NaN 33.329743 ... 52.329743 0.319787 2.319787 ] 
  [ 33.319787 1.329743 23.329743 ... 52.329743 0.319787 2.319787 ] 
  ... 
  [ 23.319787 1.329743 45.234670 ... 52.329743  0.32721 2.319787 ] 
  [ 89.319787      NaN 99.234670 ...       NaN      NaN 2.319787 ] 
  [ 84.319787 1.329743 49.329743 ... 52.329743    0.319 2.319787 ] 
  [ 12.319787 1.329743       NaN ... 52.329743 0.319787 2.319787 ] 
  [ 33.319787      NaN       NaN ... 52.329743      NaN 2.319787 ] 
                                                                  ],[...],[ # Sample n
  [ 89.319787 1.329743 99.234670 ... 52.329743 0.319787 2.319787 ] 
  [       NaN 1.329743 49.329743 ... 52.329743    0.319 2.319787 ] 
  [ 12.319787      NaN 33.329743 ... 52.329743 0.319787 2.319787 ] 
  [ 33.319787 1.329743 23.329743 ... 52.329743 0.319787 2.319787 ] 
  ... 
  [ 23.319787 1.329743 45.234670 ... 52.329743  0.32721 2.319787 ] 
  [ 89.319787      NaN 99.234670 ...       NaN      NaN 2.319787 ] 
  [ 84.319787 1.329743 49.329743 ... 52.329743    0.319 2.319787 ] 
  [ 12.319787 1.329743       NaN ... 52.329743 0.319787 2.319787 ] 
  [ 33.319787 1.329743       NaN ... 52.329743      NaN 2.319787 ] 
                                                                  ]
]

预期结果：（这只是可以完成的一种方法，因为我只需要在每个垂直“列”中使用最新的120个有效值，而每个垂直“列”必须始终具有120个以上有效值） 注意：由于示例每个样本仅显示9行，而具有最低有效元素的垂直列包含6个非NaN元素，因此可以使用6个有效值代替120个有效值。

[# Samples list
 [ # Sample 1
  [ 89.319787      NaN       NaN ...       NaN      NaN 2.319787 ] 
  [ 84.319787      NaN       NaN ... 52.329743      NaN 2.319787 ] 
  [ 12.319787 1.329743 99.234670 ... 52.329743 0.319787 2.319787 ] 
  [ 33.319787 1.329743 49.329743 ... 52.329743    0.319 2.319787 ] 
  ... 
  [ 23.319787 1.329743 33.329743 ... 52.329743 0.319787 2.319787 ] 
  [ 89.319787 1.329743 23.329743 ... 52.329743 0.319787 2.319787 ] 
  [ 84.319787 1.329743 45.234670 ... 52.329743  0.32721 2.319787 ] 
  [ 12.319787 1.329743 49.329743 ... 52.329743    0.319 2.319787 ] 
  [ 33.319787 1.329743 99.234670 ... 52.329743 0.319787 2.319787 ] 
                                                                  ],[ # Sample 2
  [ 89.319787      NaN       NaN ...       NaN      NaN 2.319787 ] 
  [ 84.319787      NaN       NaN ... 52.329743      NaN 2.319787 ] 
  [ 12.319787      NaN 99.234670 ... 52.329743 0.319787 2.319787 ] 
  [ 33.319787 1.329743 49.329743 ... 52.329743    0.319 2.319787 ] 
  ... 
  [ 23.319787 1.329743 33.329743 ... 52.329743 0.319787 2.319787 ] 
  [ 89.319787 1.329743 23.329743 ... 52.329743 0.319787 2.319787 ] 
  [ 84.319787 1.329743 45.234670 ... 52.329743  0.32721 2.319787 ] 
  [ 12.319787 1.329743 49.329743 ... 52.329743    0.319 2.319787 ] 
  [ 33.319787 1.329743 99.234670 ... 52.329743 0.319787 2.319787 ] 
                                                                  ],[ # Sample n
  [       NaN      NaN       NaN ...       NaN      NaN 2.319787 ] 
  [ 84.319787      NaN       NaN ... 52.329743      NaN 2.319787 ] 
  [ 12.319787      NaN 99.234670 ... 52.329743 0.319787 2.319787 ] 
  [ 33.319787 1.329743 49.329743 ... 52.329743    0.319 2.319787 ] 
  ... 
  [ 23.319787 1.329743 33.329743 ... 52.329743 0.319787 2.319787 ] 
  [ 89.319787 1.329743 23.329743 ... 52.329743 0.319787 2.319787 ] 
  [ 84.319787 1.329743 45.234670 ... 52.329743  0.32721 2.319787 ] 
  [ 12.319787 1.329743 49.329743 ... 52.329743    0.319 2.319787 ] 
  [ 33.319787 1.329743 99.234670 ... 52.329743 0.319787 2.319787 ] 
                                                                  ],]

样本数据：

samples = [[
[89.319787,1.329743,99.234670,52.329743,0.319787,2.319787],[84.319787,49.329743,0.319,[12.319787,np.nan,33.329743,[33.319787,23.329743,[23.319787,45.234670,0.32721,[89.319787,2.319787]
],[
[89.319787,[np.nan,2.319787]]]

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