numpy.ma.flatnotmasked_edges

ma.flatnotmasked_edges(a)

查找第一个和最后一个未屏蔽值的索引.

期望一个一维的 MaskedArray,如果所有值都被掩码,则返回 None.

参数:

aarray_like

一维 MaskedArray

返回:

edgesndarray 或 None

数组中第一个和最后一个非掩码值的索引.如果所有值都被掩码,则返回 None.

参见

flatnotmasked_contiguous, notmasked_contiguous, notmasked_edges

clump_masked, clump_unmasked

备注

仅接受 1-D 数组.

示例

>>> import numpy as np
>>> a = np.ma.arange(10)
>>> np.ma.flatnotmasked_edges(a)
array([0, 9])

>>> mask = (a < 3) | (a > 8) | (a == 5)
>>> a[mask] = np.ma.masked
>>> np.array(a[~a.mask])
array([3, 4, 6, 7, 8])

>>> np.ma.flatnotmasked_edges(a)
array([3, 8])

>>> a[:] = np.ma.masked
>>> print(np.ma.flatnotmasked_edges(a))
None