Call the correct Numerical Recipes Bessel function bessels is a function which calls the numerical recipes routine of the appropriate order -- this is to avoid to many if - then statements in the program. Note that we are determining I_n(x) e^(-x) to avoid large argument errors.
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| integer | :: | n |
Bessel function order. |
|||
| real | :: | x |
Bessel function argument. |