numpy.real

numpy.real(val)[源代码]

Return the real part of the complex argument.

Parameters:
val : array_like

Input array.

Returns:
out : ndarray or scalar

The real component of the complex argument. If val is real, the type of val is used for the output. If val has complex elements, the returned type is float.

Examples

>>> a = np.array([1+2j, 3+4j, 5+6j])
>>> a.real
array([ 1.,  3.,  5.])
>>> a.real = 9
>>> a
array([ 9.+2.j,  9.+4.j,  9.+6.j])
>>> a.real = np.array([9, 8, 7])
>>> a
array([ 9.+2.j,  8.+4.j,  7.+6.j])
>>> np.real(1 + 1j)
1.0