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! JELP computes Jacobian elliptic functions SN(u), CN(u), DN(u).
Licensing:
This routine is copyrighted by Shanjie Zhang and Jianming Jin. However,
they give permission to incorporate this routine into a user program
provided that the copyright is acknowledged.
Modified:
08 July 2012
Author:
Shanjie Zhang, Jianming Jin
Reference:
Shanjie Zhang, Jianming Jin,
Computation of Special Functions,
Wiley, 1996,
ISBN: 0-471-11963-6,
LC: QA351.C45.
Parameters:
Input, real ( kind = 8 ) U, the argument.
Input, real ( kind = 8 ) HK, the modulus, between 0 and 1.
Output, real ( kind = 8 ) ESN, ECN, EDN, EPH, the values of
sn(u), cn(u), dn(u), and phi (in degrees).
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| real(kind=8) | :: | u | ||||
| real(kind=8) | :: | hk | ||||
| real(kind=8) | :: | esn | ||||
| real(kind=8) | :: | ecn | ||||
| real(kind=8) | :: | edn | ||||
| real(kind=8) | :: | eph |