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*DECK LIBWTF
SUBROUTINE LIBWTF(NGROUP,NTMP,TERP,SCAT,SIGS,TMPXS,TMPSC)
*
*-----------------------------------------------------------------------
*
*Purpose:
* Perform temperature interpolation for WIMS-E P1 scattering matrices.
*
*Copyright:
* Copyright (C) 2016 Ecole Polytechnique de Montreal
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version
*
*Author(s): A. Hebert
*
*Parameters: input
* NGROUP number of energy groups.
* NTMP number of temperatures.
* TERP temperature coefficients.
* TMPXS temperature dependent vectorial scattering cross sections.
* TMPSC temperature dependent scattering matrix.
*
*Parameters: output
* SCAT complete scattering matrix from ig to jg.
* SIGS scattering cross sections.
*
*-----------------------------------------------------------------------
*
IMPLICIT NONE
*----
* INTERFACE VARIABLES
*----
INTEGER NGROUP,NTMP
DOUBLE PRECISION TERP(NTMP)
REAL SCAT(NGROUP,NGROUP),SIGS(NGROUP),
> TMPXS(NGROUP,NTMP),TMPSC(NGROUP,NGROUP,NTMP)
*----
* LOCAL VARIABLES
*----
INTEGER IGF,ITM,IGD
REAL RTERP
*----
* INTERPOLATE SCATTERING CROSS SECTIONS IN TEMPERATURE
*----
SIGS(:NGROUP)=0.0
SCAT(:NGROUP,:NGROUP)=0.0
DO 130 ITM=1,NTMP
RTERP=REAL(TERP(ITM))
IF(RTERP.NE.0.0D0) THEN
DO 131 IGD=1,NGROUP
SIGS(IGD)=SIGS(IGD)+RTERP*TMPXS(IGD,ITM)
DO 132 IGF=1,NGROUP
SCAT(IGF,IGD)=SCAT(IGF,IGD)+RTERP*TMPSC(IGF,IGD,ITM)
132 CONTINUE
131 CONTINUE
ENDIF
130 CONTINUE
RETURN
END
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