Modified Bessel function of the first kind, order zero.
Loading LOADSUB ALL FROM "BESMC.HTS"
or LOADSUB FROM "MATHLIB.HTS"
Usage REAL X,Y
Y=FNI0(X)
Description
FNI0returns the value of the modified cylindrical Bessel function of the first kind and order zero ofx,I0(x).I0(x) is defined for all values ofx, but large absolute values ofxmay cause the result to be larger than MAXREAL, the largest value representable.
Errors
FNI0causes an HTBasic error if its argument is not of type REAL or if the result would be larger than MAXREAL.