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  (c) TransEra Corp, 2021
In
Modified Bessel function of the first kind, order n.
 
Loading        LOADSUB ALL FROM "BESMC.HTS"
or LOADSUB FROM "MATHLIB.HTS"
 
Usage                INTEGER N
REAL X,Y
Y=FNIn(N,X)
 
Description                
FNIn returns the value of the modified cylindrical Bessel function of the first kind and order n of x, In(x). In(x) is defined for all values of n and all values of x, but large absolute values of x may cause the absolute value of the result to be larger than MAXREAL, the largest value representable.
 
Errors                
FNIn causes an HTBasic error if its arguments are not of the types listed in the USAGE section, above, or if the result would be larger than MAXREAL.
 
In(x)
See Also        I0, I1e, In, K0
 
Note
The algorithm used computes the value of In using a recursion from the values of I0 and I1. The computation time increases with n and the computation accuracy decreases with n.