This is documentation for an old release of SciPy (version 0.10.0). Read this page Search for this page in the documentation of the latest stable release (version 1.15.1).

scipy.special.yn

scipy.special.yn(x1, x2[, out]) = <ufunc 'yn'>

y=yn(n,x) returns the Bessel function of the second kind of integer order n at x.