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//
// A rust binding for the GSL library by Guillaume Gomez (guillaume1.gomez@gmail.com)
//

/*!
The Jacobian Elliptic functions are defined in Abramowitz & Stegun, Chapter 16.
!*/

use crate::Value;

/// This function computes the Jacobian elliptic functions sn(u|m), cn(u|m), dn(u|m) by descending
/// Landen transformations.
///
/// Returns `(Value, sn, cn, dn)`.
#[doc(alias = "gsl_sf_elljac_e")]
pub fn elljac_e(u: f64, m: f64) -> (Value, f64, f64, f64) {
    let mut sn = 0.;
    let mut cn = 0.;
    let mut dn = 0.;
    let ret = unsafe { ::sys::gsl_sf_elljac_e(u, m, &mut sn, &mut cn, &mut dn) };
    (Value::from(ret), sn, cn, dn)
}