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

---
 Trivac/src/FLDXCO.f | 72 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100755 Trivac/src/FLDXCO.f

(limited to 'Trivac/src/FLDXCO.f')

diff --git a/Trivac/src/FLDXCO.f b/Trivac/src/FLDXCO.f
new file mode 100755
index 0000000..a1022cc
--- /dev/null
+++ b/Trivac/src/FLDXCO.f
@@ -0,0 +1,72 @@
+*DECK FLDXCO
+      SUBROUTINE FLDXCO(IPFLUX,L4,NUN,VECT,LMPR,B)
+*
+*-----------------------------------------------------------------------
+*
+*Purpose:
+* Compare two solutions and print the logarithm of error.
+*
+*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): A. Hebert
+*
+*Parameters: input
+* IPFLUX  L_FLUX pointer to the solution.
+* L4      order of matrix systems.
+* NUN     number of unknowns in each energy group.
+* VECT    unknown vector.
+* LMPR    logarithm print flag (.true. to print the logarithm value).
+*
+*Parameters: output
+* B      base 10 logarithm of the error.
+*
+*-----------------------------------------------------------------------
+*
+      USE GANLIB
+*----
+*  SUBROUTINE ARGUMENTS
+*----
+      TYPE(C_PTR) IPFLUX
+      INTEGER L4,NUN
+      REAL VECT(NUN),B
+      LOGICAL LMPR
+*----
+*  LOCAL VARIABLES
+*----
+      REAL, DIMENSION(:), ALLOCATABLE :: REF
+*
+      CALL LCMLEN(IPFLUX,'REF',ILONG,ITYLCM)
+      IF(ILONG.EQ.0) RETURN
+      IF(ILONG.NE.NUN) CALL XABORT('FLDXCO: INVALID LENGTH FOR REF.')
+      ALLOCATE(REF(ILONG))
+      CALL LCMGET(IPFLUX,'REF',REF)
+      IN=0
+      ERR1=0.0
+      DO 5 I=1,L4
+      IF(ABS(REF(I)).GT.ERR1) THEN
+         IN=I
+         ERR1=ABS(REF(I))
+      ENDIF
+    5 CONTINUE
+      WEIGHT=REF(IN)/VECT(IN)
+      ERR2=0.0
+      DO 10 I=1,L4
+      ERR2=AMAX1(ERR2,ABS(REF(I)-VECT(I)*WEIGHT))
+   10 CONTINUE
+      DEALLOCATE(REF)
+      A=ERR2/ERR1
+      IF(A.GT.0.0) THEN
+         B=LOG10(A)
+      ELSE
+         B=-5.0
+      ENDIF
+      IF(LMPR) WRITE (6,20) A,B
+      RETURN
+*
+   20 FORMAT (7H ERROR=,1P,E10.2,5X,11HLOG(ERROR)=,E10.2)
+      END
-- 
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