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  (c) TransEra Corp, 2021
Jn
Bessel function of the first kind, order n.
 
Loading        LOADSUB ALL FROM "BESRC.HTS"
or LOADSUB FROM "MATHLIB.HTS"
 
Usage                INTEGER N
REAL X,Y
Y=FNJn(N,X)
 
Description                
FNJn returns the value of the cylindrical Bessel function of the first kind and order n of x, Jn(x). Jn(x) is defined for all values of n and x.
 
Errors                
FNJn causes an HTBasic error if its arguments are not of the types listed in the USAGE section, above.
 
Note
The algorithm used computes the value of Jn using a recursion from the values of J0 and J1. The computation time increases with n and the computation accuracy decreases with n.
 
Jn(x)