Spherical Hankel function of the second kind, order one.
Loading LOADSUB ALL FROM "BESRS.HTS"
or LOADSUB FROM "MATHLIB.HTS"
Usage REAL X
COMPLEX C
C=FNS_h21(X)
Description
FNS_h21returns the value of the Hankel function of the second kind and order one ofx,h1(2)(x). The real component returned containsj1(x) and the imaginary component returned contains -y1(x).
Errors
FNS_h21causes an HTBasic error if its argument is not of type REAL. It also causes an error if the value ofxis near zero, since the imaginary component ofh1(2)(0) is infinite.