Thank you both, Hiroyuki and Robin,
> "Robin" == Robin Hankin <[EMAIL PROTECTED]>
> on Tue, 19 Jun 2007 10:25:27 +0100 writes:
Robin> I can reproduce both these bugs and confirm that the suggested fix
Robin> agrees with Mathematica and Maple for a few trial values.
Robin
I can reproduce both these bugs and confirm that the suggested fix
agrees with Mathematica and Maple for a few trial values.
I can confirm that Hiroyuki's algebra is indeed
consistent with AMS-55 equation 9.1.2
and the old source isn't. I'd need more
time to look at equation 9.6.2.
I'm not sure
#bug 1: besselI() for nu<0 and expon.scaled=TRUE
#tested with R-devel (2007-06-17 r41981)
x <- 2.3
nu <- -0.4
print(paste(besselI(x, nu, TRUE), "=", exp(-x)*besselI(x, nu, FALSE)))
#fix:
#$ diff bessel_i_old.c bessel_i_new.c
#57c57
#< bessel_k(x, -alpha, expo) * ((ize == 1)? 2. : 2.*exp(-x))/M_PI
