s18dc {NAGFWrappers} | R Documentation |
s18dc returns a sequence of values for the modified Bessel functions K_ν + n(z) for complex z, non-negative ν and n = 0 , 1 , . . . , N - 1, with an option for exponential scaling.
s18dc(fnu, z, n, scal)
fnu |
double ν, the order of the first member of the sequence of functions. |
z |
complex The argument z of the functions. |
n |
integer N, the number of members required in the sequence K_ν(z) , K_ν + 1(z) , . . . , K_ν + N - 1(z). |
scal |
string The scaling option. scal='U': The results are returned unscaled. scal='S': The results are returned scaled by the factor e^z. |
R interface to the NAG Fortran routine S18DCF.
CY |
complex array The N required function values: cy[i] contains K_ν + i - 1(z) for i=1 . . . N. |
NZ |
integer The number of components of cy that are set to zero due to underflow. If nz > 0 and Re(z) >= 0.0, elements cy[1] , cy[2] , . . . , cy[nz] are set to zero. If Re(z) < 0.0, nz simply states the number of underflows, and not which elements they are. |
IFAIL |
integer ifail =0unless the function detects an error or a warning has been flagged (see the Errors section in Fortran library documentation). |
NAG
http://www.nag.co.uk/numeric/FL/nagdoc_fl23/pdf/S/s18dcf.pdf
ifail<-0 fnu<-0 z<-complex(1,0.3,0.4) n<-2 scal<-'U' s18dc(fnu,z,n,scal)