Hi all, 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? -- Regards, Chris Vanlangenberg [[alternative HTML version deleted]]