LALInspiralTofV.c

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/*
*  Copyright (C) 2007 David Churches, B.S. Sathyaprakash
*
*  This program is free software; you can redistribute it and/or modify
*  it under the terms of the GNU General Public License as published by
*  the Free Software Foundation; either version 2 of the License, or
*  (at your option) any later version.
*
*  This program is distributed in the hope that it will be useful,
*  but WITHOUT ANY WARRANTY; without even the implied warranty of
*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
*  GNU General Public License for more details.
*
*  You should have received a copy of the GNU General Public License
*  along with with program; see the file COPYING. If not, write to the
*  Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
*  MA  02111-1307  USA
*/

/*  <lalVerbatim file="LALInspiralTofVCV">
Author: Sathyaprakash, B. S.
$Id: LALInspiralTofV.c,v 1.3 2007/06/08 14:41:49 bema Exp $
</lalVerbatim>  */

/*  <lalLaTeX>

\subsection{Module \texttt{LALInspiralTofV.c}}

This module outputs 
\begin{equation}
{\tt tofv} = t - t_0 + m \int_{v_0}^{v} \frac{E'(v)}{{\cal F}(v)} \, dv\,.
\end{equation}
where the constants $t,$ $t_0,$ $v_0,$ and functions in the integrand 
$E'(v)$ and ${\cal F}(v)$ are defined in the {\tt void} structure {\tt params.}

\subsubsection*{Prototypes}
\vspace{0.1in}
\input{LALInspiralTofVCP}
\index{\verb&LALInspiralTofV()&}

\subsubsection*{Description}


\subsubsection*{Algorithm}


\subsubsection*{Uses}

\texttt{LALDRombergIntegrate}

\subsubsection*{Notes}

\vfill{\footnotesize\input{LALInspiralTofVCV}}

</lalLaTeX>  */



#include <math.h>
#include <lal/LALStdlib.h>
#include <lal/LALInspiral.h>
#include <lal/Integrate.h>

NRCSID (LALINSPIRALTOFVC, "$Id: LALInspiralTofV.c,v 1.3 2007/06/08 14:41:49 bema Exp $");

/*  <lalVerbatim file="LALInspiralTofVCP"> */
void 
LALInspiralTofV (
   LALStatus *status,
   REAL8 *tofv,
   REAL8 v,
   void *params
   )
{ /* </lalVerbatim>  */

   void *funcParams;
   DIntegrateIn intinp;
   TofVIntegrandIn in2;
   TofVIn *in1;
   REAL8 answer;
   REAL8 sign;


   INITSTATUS (status, "LALInspiralTofV", LALINSPIRALTOFVC);
   ATTATCHSTATUSPTR(status);

   ASSERT (tofv, status, LALINSPIRALH_ENULL, LALINSPIRALH_MSGENULL);
   ASSERT (params, status, LALINSPIRALH_ENULL, LALINSPIRALH_MSGENULL);
   ASSERT(v > 0., status, LALINSPIRALH_ESIZE, LALINSPIRALH_MSGESIZE);
   ASSERT(v < 1., status, LALINSPIRALH_ESIZE, LALINSPIRALH_MSGESIZE);

   sign = 1.0;


   in1 = (TofVIn *) params;

   intinp.function = LALInspiralTofVIntegrand;
   intinp.xmin = in1->v0;
   intinp.xmax = v;
   intinp.type = ClosedInterval;


   in2.dEnergy = in1->dEnergy;
   in2.flux = in1->flux;
   in2.coeffs = in1->coeffs;

   funcParams = (void *) &in2;

   if (v==in1->v0)
   {
     *tofv = in1->t - in1->t0;
     DETATCHSTATUSPTR(status);
     RETURN (status);
   }

   if(in1->v0 > v)
   {
      intinp.xmin = v;
      intinp.xmax = in1->v0;
      sign = -1.0;
   }
        
   LALDRombergIntegrate (status->statusPtr, &answer, &intinp, funcParams);
   CHECKSTATUSPTR(status);

   *tofv = in1->t - in1->t0 + in1->totalmass*answer*sign;

   DETATCHSTATUSPTR(status);
   RETURN (status);
}

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