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*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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