numpy.
real_if_close
If complex input returns a real array if complex parts are close to zero.
“Close to zero” is defined as tol * (machine epsilon of the type for a).
Input array.
Tolerance in machine epsilons for the complex part of the elements in the array.
If a is real, the type of a is used for the output. If a has complex elements, the returned type is float.
See also
real, imag, angle
real
imag
angle
Notes
Machine epsilon varies from machine to machine and between data types but Python floats on most platforms have a machine epsilon equal to 2.2204460492503131e-16. You can use ‘np.finfo(float).eps’ to print out the machine epsilon for floats.
Examples
>>> np.finfo(float).eps 2.2204460492503131e-16 # may vary
>>> np.real_if_close([2.1 + 4e-14j], tol=1000) array([2.1]) >>> np.real_if_close([2.1 + 4e-13j], tol=1000) array([2.1+4.e-13j])