[R] Second order bessel function

[Hans W Borchers]

On Wed Mar 4 21:32:30 CET 2015 Chris Vanlangenberg writes:
>
> I want to compute the numerical values for modified second order bessel
> function given x and other parameters, currently base R has a bessel
> function for 1st order and I have tried to use the relationship between 1st
> and 2nd order to compute the 2nd order bessel function, but I ended up
> getting a zero.
>
> Any suggestions how to proceed on this? or any alternative methods?

R has the Bessel and modified Bessel functions of first and second kind, of
integer and fractional order. Package 'Bessel' contains Bessel functions for
real and complex numbers. Package 'gsl' provides access to lots of special
Bessel functions.

What exactly are you looking for?

>
> Regards,
> Chris Vanlangenberg