Modified Bessel function of the second kind, order one.
Loading LOADSUB ALL FROM "BESMC.HTS"
or LOADSUB FROM "MATHLIB.HTS"
Usage REAL X,Y
Y=FNK1(X)
Description
FNK1returns the value of the modified cylindrical Bessel function of the second kind and order one ofx,K1(x).K1(x) is defined for all positive values ofx, but values ofxnear zero may cause the absolute value of the result to be larger than MAXREAL, the largest value representable.
Errors
FNK1causes an HTBasic error if its argument is not of type REAL, ifxis not positive, or if the result would be larger than MAXREAL.