Module « scipy.special »
Signature de la fonction ber
Description
ber.__doc__
ber(x, /, out=None, *, where=True, casting='same_kind', order='K', dtype=None, subok=True[, signature, extobj])
ber(x, out=None)
Kelvin function ber.
Defined as
.. math::
\mathrm{ber}(x) = \Re[J_0(x e^{3 \pi i / 4})]
where :math:`J_0` is the Bessel function of the first kind of
order zero (see `jv`). See [dlmf]_ for more details.
Parameters
----------
x : array_like
Real argument.
out : ndarray, optional
Optional output array for the function results.
Returns
-------
scalar or ndarray
Values of the Kelvin function.
See Also
--------
bei : the corresponding real part
berp : the derivative of bei
jv : Bessel function of the first kind
References
----------
.. [dlmf] NIST, Digital Library of Mathematical Functions,
https://dlmf.nist.gov/10.61
Examples
--------
It can be expressed using Bessel functions.
>>> import scipy.special as sc
>>> x = np.array([1.0, 2.0, 3.0, 4.0])
>>> sc.jv(0, x * np.exp(3 * np.pi * 1j / 4)).real
array([ 0.98438178, 0.75173418, -0.22138025, -2.56341656])
>>> sc.ber(x)
array([ 0.98438178, 0.75173418, -0.22138025, -2.56341656])
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