numpy.isreal#
- numpy.isreal(x)[source]#
Returns a bool array, where True if input element is real.
If element has complex type with zero imaginary part, the return value for that element is True.
- Parameters:
- xarray_like
Input array.
- Returns:
- outndarray, bool
Boolean array of same shape as x.
Notes
isreal
may behave unexpectedly for string or object arrays (see examples)Examples
>>> a = np.array([1+1j, 1+0j, 4.5, 3, 2, 2j], dtype=complex) >>> np.isreal(a) array([False, True, True, True, True, False])
The function does not work on string arrays.
>>> a = np.array([2j, "a"], dtype="U") >>> np.isreal(a) # Warns about non-elementwise comparison False
Returns True for all elements in input array of
dtype=object
even if any of the elements is complex.>>> a = np.array([1, "2", 3+4j], dtype=object) >>> np.isreal(a) array([ True, True, True])
isreal should not be used with object arrays
>>> a = np.array([1+2j, 2+1j], dtype=object) >>> np.isreal(a) array([ True, True])