numpy.ma.compress_rowcols

numpy.ma.compress_rowcols(x, axis=None)[源代码]

Suppress the rows and/or columns of a 2-D array that contain masked values.

The suppression behavior is selected with the axis parameter.

  • If axis is None, both rows and columns are suppressed.
  • If axis is 0, only rows are suppressed.
  • If axis is 1 or -1, only columns are suppressed.
Parameters:
x : array_like, MaskedArray

The array to operate on. If not a MaskedArray instance (or if no array elements are masked), x is interpreted as a MaskedArray with mask set to nomask. Must be a 2D array.

axis : int, optional

Axis along which to perform the operation. Default is None.

Returns:
compressed_array : ndarray

The compressed array.

Examples

>>> x = np.ma.array(np.arange(9).reshape(3, 3), mask=[[1, 0, 0],
...                                                   [1, 0, 0],
...                                                   [0, 0, 0]])
>>> x
masked_array(data =
 [[-- 1 2]
 [-- 4 5]
 [6 7 8]],
             mask =
 [[ True False False]
 [ True False False]
 [False False False]],
       fill_value = 999999)
>>> np.ma.compress_rowcols(x)
array([[7, 8]])
>>> np.ma.compress_rowcols(x, 0)
array([[6, 7, 8]])
>>> np.ma.compress_rowcols(x, 1)
array([[1, 2],
       [4, 5],
       [7, 8]])