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Bessel function of second kind

`Y = bessely(nu,Z)`

Y = bessely(nu,Z,1)

`Y = bessely(nu,Z)`

computes
Bessel functions of the second kind, *Y*_{ν}(*z*),
for each element of the array `Z`

. The order `nu`

need
not be an integer, but must be real. The argument `Z`

can
be complex. The result is real where `Z`

is positive.

If `nu`

and `Z`

are arrays
of the same size, the result is also that size. If either input is
a scalar, it is expanded to the other input's size.

`Y = bessely(nu,Z,1)`

computes `bessely(nu,Z).*exp(-abs(imag(Z)))`

.

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