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*DECK FLDONE
FUNCTION FLDONE(X,B,N,IPTRK,IPSYS,IPFLUX) RESULT(Y)
*
*-----------------------------------------------------------------------
*
*Purpose:
* Computation of a single X+M*(B-A*X) iteration in TRIVAC.
*
*Copyright:
* Copyright (C) 2020 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
* X initial flux.
* B fixed source.
* N number of unknowns in the flux.
* IPTRK L_TRACK pointer to the tracking information.
* IPSYS L_SYSTEM pointer to system matrices.
* IPFLUX L_FLUX pointer to the solution.
*
*Parameters: output
* Y flux at the next iteration.
*
*-----------------------------------------------------------------------
*
USE GANLIB
*----
* SUBROUTINE ARGUMENTS
*----
INTEGER, INTENT(IN) :: N
REAL(KIND=8), DIMENSION(N), INTENT(IN) :: X, B
REAL(KIND=8), DIMENSION(N) :: Y
TYPE(C_PTR) IPTRK,IPSYS,IPFLUX
*----
* LOCAL VARIABLES
*----
PARAMETER(NSTATE=40)
INTEGER ISTATE(NSTATE)
CHARACTER*12 TEXT12
REAL, DIMENSION(:), ALLOCATABLE :: WORK1,WORK2,GAR
*
CALL LCMGET(IPTRK,'STATE-VECTOR',ISTATE)
NLF=ISTATE(30)
CALL LCMGET(IPSYS,'STATE-VECTOR',ISTATE)
NGRP=ISTATE(1)
LL4=ISTATE(2)
ITY=ISTATE(4)
NBMIX=ISTATE(7)
NAN=ISTATE(8)
IF(ITY.EQ.13) LL4=LL4*NLF/2 ! SPN cases
CALL LCMGET(IPFLUX,'STATE-VECTOR',ISTATE)
IGR=ISTATE(39)
IF(LL4.NE.N) CALL XABORT('FLDONE: INCONSISTENT UNKNOWNS.')
*----
* SCRATCH STORAGE ALLOCATION
*----
ALLOCATE(WORK1(LL4),WORK2(LL4))
WRITE(TEXT12,'(1HA,2I3.3)') IGR,IGR
WORK1(:LL4)=REAL(B(:LL4))
WORK2(:LL4)=REAL(X(:LL4))
IF(ITY.EQ.2) THEN
* CLASSICAL TREATMENT
ALLOCATE(GAR(LL4))
CALL MTLDLM(TEXT12,IPTRK,IPSYS,LL4,ITY,WORK2,GAR)
GAR(:LL4)=WORK1(:LL4)-GAR(:LL4)
CALL MTLDLS(TEXT12,IPTRK,IPSYS,LL4,ITY,GAR)
WORK2(:LL4)=WORK2(:LL4)+GAR(:LL4)
DEALLOCATE(GAR)
ELSE IF(ITY.EQ.3) THEN
* THOMAS-RAVIART/DIFFUSION TRIVAC TRACKING.
CALL FLDTRS(TEXT12,IPTRK,IPSYS,LL4,WORK1,WORK2,1)
ELSE IF(ITY.EQ.13) THEN
* THOMAS-RAVIART/SIMPLIFIED PN TRIVAC TRACKING.
IF(NAN.EQ.0) CALL XABORT('FLDONE: SPN-ONLY ALGORITHM(2).')
CALL FLDSPN(TEXT12,IPTRK,IPSYS,LL4,NBMIX,NAN,WORK1,WORK2,1)
ELSE
CALL XABORT('FLDONE: INVALID TYPE.')
ENDIF
Y(:LL4)=WORK2(:LL4)
DEALLOCATE(WORK2,WORK1)
RETURN
END FUNCTION FLDONE
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