From 7dfcc480ba1e19bd3232349fc733caef94034292 Mon Sep 17 00:00:00 2001
From: stainer_t <thomas.stainer@oecd-nea.org>
Date: Mon, 8 Sep 2025 13:48:49 +0200
Subject: Initial commit from Polytechnique Montreal

---
 Dragon/src/PIJRGL.f | 151 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 151 insertions(+)
 create mode 100644 Dragon/src/PIJRGL.f

(limited to 'Dragon/src/PIJRGL.f')

diff --git a/Dragon/src/PIJRGL.f b/Dragon/src/PIJRGL.f
new file mode 100644
index 0000000..ed5dfe8
--- /dev/null
+++ b/Dragon/src/PIJRGL.f
@@ -0,0 +1,151 @@
+*DECK PIJRGL
+      SUBROUTINE PIJRGL(IPRT,NREG,NSOUT,SIGTAL,PROB)
+*
+*-----------------------------------------------------------------------
+*
+*Purpose:
+* Gelbard normalization of collision probs (CP).
+*
+*Copyright:
+* Copyright (C) 1991 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): R. Roy, G. Marleau
+*
+*Parameters: input
+* IPRT    print level.
+* NREG    number of zones for geometry.
+* NSOUT   number of surfaces for geometry.
+* SIGTAL  albedo-sigt vector.
+*
+*Parameters: input/output
+* PROB    CP matrix for all types.
+*
+*References:
+* R. Roy and G. Marleau,
+* Normalization Techniques for CP Matrices,
+* CONF/PHYSOR-90, Marseille/France, V 2, P IX-40 (1990).
+*-----------------------------------------------------------------------
+*
+      IMPLICIT   NONE
+      INTEGER    IPRT,NREG,NSOUT,IUNOUT,IPRINT,
+     >           IPRB,IPRF,IUNK,JUNK,IVOL,JVOL,IR,JR,
+     >           NSURM,NSURC,NVOLM,NVOLC,IP
+      PARAMETER (IUNOUT=6, IPRINT=4)
+      REAL       SIGTAL(-NSOUT:NREG)
+      DOUBLE PRECISION PROB(*),RBARRE,GBARRE
+      DOUBLE PRECISION, ALLOCATABLE, DIMENSION(:) :: RI
+C----
+C  SCRATCH STORAGE ALLOCATION
+C----
+      ALLOCATE(RI(-NSOUT:NREG))
+C
+      RBARRE=0.0
+      GBARRE=0.0
+      IPRB= 0
+      IUNK= 0
+      IVOL= NSOUT*(NSOUT+1)/2
+C
+C     COMPUTE R-SUB(I) FACTORS AND: GBARRE, RBARRE
+      DO 30 IR=-NSOUT, NREG
+         IUNK= IUNK+1
+         RI(IR)=0.0
+         DO 10 JR=-NSOUT, IR
+            IPRB= IPRB+1
+            IF( JR.LT.0.OR.SIGTAL(JR).GT.0.0 )THEN
+               RI(IR)=RI(IR)+PROB(IPRB)
+            ENDIF
+   10    CONTINUE
+         IPRF= IPRB
+         JUNK= IUNK
+         DO 20 JR= IR+1 , NREG
+            IPRF= IPRF+JUNK
+            JUNK= JUNK+1
+            IF( JR.LT.0.OR.SIGTAL(JR).GT.0.0 )THEN
+               RI(IR)=RI(IR)+PROB(IPRF)
+            ENDIF
+   20    CONTINUE
+         IF( IR.LT.0 )THEN
+            IVOL= IVOL+1
+            RI(IR)= PROB(IVOL)-RI(IR)
+            GBARRE= GBARRE+PROB(IVOL)
+            RBARRE= RBARRE+RI(IR)
+         ELSEIF( IR.GT.0 )THEN
+            IVOL= IVOL+IUNK-1
+            RI(IR)= PROB(IVOL)-RI(IR)
+            IF( SIGTAL(IR).GT.0.0 )THEN
+               GBARRE= GBARRE+PROB(IVOL)
+               RBARRE= RBARRE+RI(IR)
+            ENDIF
+         ELSE
+            IVOL= IVOL+1
+            RI(IR)=0.0
+         ENDIF
+   30 CONTINUE
+      GBARRE=1.0/GBARRE
+      RBARRE=RBARRE*GBARRE
+C
+C     RENORMALIZE PROB MATRIX
+      IVOL= NSOUT*(NSOUT+1)/2
+      IPRB= 0
+      IUNK= 0
+      DO 210 IR   = -NSOUT, NREG
+         IF( IR.LE.0 )THEN
+            IVOL= IVOL+1
+         ELSE
+            IVOL= IVOL+IUNK
+         ENDIF
+         IUNK= IUNK+1
+         JVOL= NSOUT*(NSOUT+1)/2
+         JUNK= 0
+         DO 200 JR= -NSOUT, IR
+            IF( JR.LE.0 )THEN
+               JVOL= JVOL+1
+            ELSE
+               JVOL= JVOL+JUNK
+            ENDIF
+            JUNK= JUNK+1
+            IPRB= IPRB+1
+            IF( IR.NE.0.AND.JR.NE.0 )THEN
+               PROB(IPRB)= PROB(IPRB)+(PROB(JVOL)*RI(IR)
+     >         +PROB(IVOL)*RI(JR)-PROB(IVOL)*PROB(JVOL)*RBARRE)*GBARRE
+            ENDIF
+ 200     CONTINUE
+ 210  CONTINUE
+C
+C     PRINT IF REQUESTED
+      IF( IPRT.GE.IPRINT )THEN
+         WRITE(IUNOUT,'(19H0  GLOBAL FACTORS: ,
+     >         8H RBARRE=,1P,F11.5,5X,7HGBARRE=,F11.5)')
+     >            RBARRE,               GBARRE
+         WRITE(IUNOUT,'(30H0 SURFACE ADJUSTMENT FACTORS             /)')
+         NSURC = -1
+         DO 300 IP  = 1, (9 +NSOUT) / 10
+            NSURM= MAX( -NSOUT, NSURC-9 )
+            WRITE(IUNOUT,'(10X,10( A5,    I6)/)')
+     >                     (' SUR ',-IR,IR= NSURC, NSURM, -1)
+            WRITE(IUNOUT,'(10H R-SUB(I) ,10F11.5)')
+     >                   (RI(IR),IR=NSURC,NSURM,-1)
+            NSURC = NSURC - 10
+ 300     CONTINUE
+         WRITE(IUNOUT,'(30H0  VOLUME ADJUSTMENT FACTORS             /)')
+         NVOLC =  1
+         DO 310 IP  = 1, (9 + NREG) / 10
+            NVOLM= MIN( NREG, NVOLC+9 )
+            WRITE(IUNOUT,'(10X,10( A5 ,  I6)/)')
+     >                  (' VOL ',IR,IR=NVOLC,NVOLM, 1)
+            WRITE(IUNOUT,'(10H R-SUB(I) ,10F11.5)')
+     >                   (RI(IR),IR=NVOLC,NVOLM, 1)
+            NVOLC = NVOLC + 10
+ 310     CONTINUE
+      ENDIF
+C----
+C  SCRATCH STORAGE DEALLOCATION
+C----
+      DEALLOCATE(RI)
+C
+      RETURN
+      END
-- 
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