Scaled 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=FNK1e(X)
Description
K1ereturns the value of the modified cylindrical Bessel function of the second kind and order one ofxscaled byex,exK1(x). AlthoughexK1(x) is defined for all positive values ofx, values ofxnear zero may cause the absolute value of the result to be larger than MAXREAL, the largest value representable. The scaling is done so that the value ofK1(x) can be evaluated for large arguments, where the absolute value ofK1(x) may be near zero.
Errors
K1ecauses an HTBasic error if its argument is not of type REAL, ifxis not positive, or if the result would be larger than MAXREAL.