numpy.ma.default_fill_value

numpy.ma.default_fill_value(obj)[源代码]

Return the default fill value for the argument object.

The default filling value depends on the datatype of the input array or the type of the input scalar:

datatype default
bool True
int 999999
float 1.e20
complex 1.e20+0j
object ‘?’
string ‘N/A’

For structured types, a structured scalar is returned, with each field the default fill value for its type.

For subarray types, the fill value is an array of the same size containing the default scalar fill value.

Parameters:
obj : ndarray, dtype or scalar

The array data-type or scalar for which the default fill value is returned.

Returns:
fill_value : scalar

The default fill value.

Examples

>>> np.ma.default_fill_value(1)
999999
>>> np.ma.default_fill_value(np.array([1.1, 2., np.pi]))
1e+20
>>> np.ma.default_fill_value(np.dtype(complex))
(1e+20+0j)