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

---
 Utilib/src/RENINS.f | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 Utilib/src/RENINS.f

(limited to 'Utilib/src/RENINS.f')

diff --git a/Utilib/src/RENINS.f b/Utilib/src/RENINS.f
new file mode 100644
index 0000000..f5a1029
--- /dev/null
+++ b/Utilib/src/RENINS.f
@@ -0,0 +1,49 @@
+*DECK RENINS
+      SUBROUTINE RENINS(SIZE,LEV,DEG)
+*
+*-----------------------------------------------------------------------
+*
+*Purpose:
+* Sort a level by increasing degree using the "Insertion method".
+*
+*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): R. Le Tellier
+*
+*Parameters: input
+* SIZE    number of nodes in the level.
+* LEV     level to sort.
+* DEG     degrees of the level.
+*
+*-----------------------------------------------------------------------
+*
+      IMPLICIT NONE
+*---
+* SUBROUTINE ARGUMENTS
+*---
+      INTEGER SIZE,LEV(SIZE),DEG(SIZE)
+*---
+* LOCAL VARIABLES
+*---
+      INTEGER I,INDD,INDL,J
+*
+      DO I=2,SIZE
+         INDD=DEG(I)
+         INDL=LEV(I)
+         J=I
+         DO WHILE ((J.GT.1).AND.(DEG(J-1).GT.INDD))
+            DEG(J)=DEG(J-1)
+            LEV(J)=LEV(J-1)
+            J=J-1
+         ENDDO
+         DEG(J)=INDD
+         LEV(J)=INDL
+      ENDDO
+*
+      RETURN
+      END
-- 
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