public void JacobiCnDoubleArgTest()
{
for (int i = 0; i < jacobiData.Length; i += 5)
{
var z = jacobiData[i];
var m = jacobiData[i + 1];
var ex = jacobiData[i + 2];
var cn = Jacobi.cn(z, m);
var err = Math.Abs(ex - cn) / Math.Abs(ex);
Assert.IsTrue(err < 1e-15);
var f = Jacobi.cnDouble(m);
var cn2 = f(z);
Assert.AreEqual(cn, cn2);
}
}