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/EDIDEL.f | 72 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 Dragon/src/EDIDEL.f

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

diff --git a/Dragon/src/EDIDEL.f b/Dragon/src/EDIDEL.f
new file mode 100644
index 0000000..8296fe1
--- /dev/null
+++ b/Dragon/src/EDIDEL.f
@@ -0,0 +1,72 @@
+*DECK EDIDEL
+      SUBROUTINE EDIDEL(IPRINT,NGCOND,NMERGE,IGR,SCATTS,INGSCT,IFGSCT,
+     >                  IPOSCT,XSCAT,DELSCT)
+*
+*-----------------------------------------------------------------------
+*
+*Purpose:
+* Scattering delta sigma calculation.
+*
+*Copyright:
+* Copyright (C) 2002 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): G. Marleau
+*
+*Parameters: input
+* IPRINT  print level (=1 to print delta sigmas).
+* NGCOND  number of condensed groups.
+* NMERGE  number of merged regions.
+* IGR     current group treated.
+* SCATTS  new scattering matrix.
+*
+*Parameters: scratch
+* INGSCT  number of scattering groups (old).
+* IFGSCT  first old scattering group.
+* IPOSCT  position of region in scattering matrix.
+* XSCAT   new scattering matrix.
+* DELSCT  scattering delta sigma.
+*
+*-----------------------------------------------------------------------
+*
+*----
+*  SUBROUTINE ARGUMENTS
+*----
+      INTEGER     IPRINT,NGCOND,NMERGE,IGR,INGSCT(NMERGE),
+     >            IFGSCT(NMERGE),IPOSCT(NMERGE)
+      REAL        SCATTS(NMERGE,NGCOND,NGCOND),XSCAT(NMERGE*NGCOND),
+     >            DELSCT(NGCOND)
+*----
+*  LOCAL VARIABLES
+*----
+      PARAMETER  (IUNOUT=6)
+*----
+*  COMPUTE DELTA SIGMA BY MATERIAL FOR ALL GROUPS
+*----
+      DO 100 IREG=1,NMERGE
+        JLASTG=IFGSCT(IREG)
+        JFRSTG=JLASTG-INGSCT(IREG)+1
+        JPOSCT=IPOSCT(IREG)+INGSCT(IREG)
+        IF(IPRINT.GE.1) THEN
+          WRITE(IUNOUT,6000) IREG,NGCOND
+        ENDIF
+        DO 110 JGR=1,NGCOND
+          IF( (JGR.LT.JFRSTG) .OR. (JGR.GT.JLASTG) ) THEN
+            DELSCT(JGR)=SCATTS(IREG,IGR,JGR)
+          ELSE
+            JPOSCT=JPOSCT-1
+            DELSCT(JGR)=SCATTS(IREG,IGR,JGR)-XSCAT(JPOSCT)
+          ENDIF
+ 110    CONTINUE
+ 100  CONTINUE
+      WRITE(IUNOUT,6001) (DELSCT(JGR),JGR=1,NGCOND)
+*----
+*  FORMAT
+*----
+ 6000 FORMAT(/' REGION=',I5,10X,'NUMBER OF GROUPS ',I10)
+ 6001 FORMAT(1P,7(3X,E15.7))
+      RETURN
+      END
-- 
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