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//Translated by Jose Antonio De Santiago-Castillo.
//E-mail:JAntonioDeSantiago@gmail.com
//Website: www.DotNumerics.com
//
//Fortran to C# Translation.
//Translated by:
//F2CSharp Version 0.72 (Dicember 7, 2009)
//Code Optimizations: , assignment operator, for-loop: array indexes
//
#endregion
using System;
namespace DotNumerics.LinearAlgebra.CSEispack
{
public class CSROOT
{
#region Dependencies
PYTHAG _pythag;
#endregion
public CSROOT(PYTHAG pythag)
{
#region Set Dependencies
this._pythag = pythag;
#endregion
}
public CSROOT()
{
#region Dependencies (Initialization)
PYTHAG pythag = new PYTHAG();
#endregion
#region Set Dependencies
this._pythag = pythag;
#endregion
}
public void Run(double XR, double XI, ref double YR, ref double YI)
{
#region Variables
double S = 0; double TR = 0; double TI = 0;
#endregion
// c
// c (yr,yi) = complex dsqrt(xr,xi)
// c branch chosen so that yr .ge. 0.0 and sign(yi) .eq. sign(xi)
// c
TR = XR;
TI = XI;
S = Math.Sqrt(0.5E0 * (this._pythag.Run(TR, TI) + Math.Abs(TR)));
if (TR >= 0.0E0) YR = S;
if (TI < 0.0E0) S = - S;
if (TR <= 0.0E0) YI = S;
if (TR < 0.0E0) YR = 0.5E0 * (TI / YI);
if (TR > 0.0E0) YI = 0.5E0 * (TI / YR);
return;
}
}
}
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