Count the nonmasked elements of the array along the given axis.
Parameters :  axis : int, optional


Returns :  result : int or ndarray

See also
Examples
>>> import numpy.ma as ma
>>> a = ma.arange(6).reshape((2, 3))
>>> a[1, :] = ma.masked
>>> a
masked_array(data =
[[0 1 2]
[  ]],
mask =
[[False False False]
[ True True True]],
fill_value = 999999)
>>> a.count()
3
When the axis keyword is specified an array of appropriate size is returned.
>>> a.count(axis=0)
array([1, 1, 1])
>>> a.count(axis=1)
array([3, 0])