numpy.ma.mask_cols

numpy.ma.mask_cols(a, axis=None) [source]

Mask columns of a 2D array that contain masked values.

This function is a shortcut to mask_rowcols with axis equal to 1.

See also

mask_rowcols

Mask rows and/or columns of a 2D array.

masked_where

Mask where a condition is met.

Examples

>>> import numpy.ma as ma
>>> a = np.zeros((3, 3), dtype=int)
>>> a[1, 1] = 1
>>> a
array([[0, 0, 0],
       [0, 1, 0],
       [0, 0, 0]])
>>> a = ma.masked_equal(a, 1)
>>> a
masked_array(
  data=[[0, 0, 0],
        [0, --, 0],
        [0, 0, 0]],
  mask=[[False, False, False],
        [False,  True, False],
        [False, False, False]],
  fill_value=1)
>>> ma.mask_cols(a)
masked_array(
  data=[[0, --, 0],
        [0, --, 0],
        [0, --, 0]],
  mask=[[False,  True, False],
        [False,  True, False],
        [False,  True, False]],
  fill_value=1)