Bessel functions of integer orders, provided via arbitrary precision algorithms from the MPFR library.

Note that the computation can be very slow when `n`

*and*
`x`

are large (and of similar magnitude).

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`x` |
a |

`n` |
non-negative integer (vector). |

`rnd.mode` |
a 1-letter string specifying how |

Computes multiple precision versions of the Bessel functions of
*integer* order, *J[n](x)* and *Y[n](x)*,
andâ€”when using MPFR library 3.0.0 or newerâ€”also of the Airy function
*Ai(x)*.

`besselJ`

, and `besselY`

compute the
same bessel functions but for arbitrary *real* order and only
precision of a bit more than ten digits.

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