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+*DECK TRIAHD
+      SUBROUTINE TRIAHD (IR,NEL,LL4,SGD,VOL,MAT,VEC)
+*
+*-----------------------------------------------------------------------
+*
+*Purpose:
+* Assembly of a diagonal system matrix corresponding to a single cross
+* section type. Mesh centered finite difference case in hexagonal
+* geometry. Note: vector VEC should be initialized by the calling
+* program.
+*
+*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
+* IR      maximum number of material mixtures.
+* NEL     total number of finite elements.
+* LL4     number of unknowns (order of the system matrices).
+* SGD     cross section per material mixture.
+* VOL     volumes.
+* MAT     index-number of the mixture type assigned to each volume.
+*
+*Parameters: output
+* VEC     diagonal system matrix.
+*
+*-----------------------------------------------------------------------
+*
+*----
+*  SUBROUTINE ARGUMENTS
+*----
+      INTEGER IR,NEL,LL4,MAT(NEL)
+      REAL SGD(IR),VOL(NEL),VEC(LL4)
+*
+      KEL=0
+      DO 10 K=1,NEL
+      L=MAT(K)
+      IF(L.EQ.0) GO TO 10
+      KEL=KEL+1
+      VOL0=VOL(K)
+      IF(VOL0.EQ.0.0) GO TO 10
+      VEC(KEL)=VEC(KEL)+SGD(L)*VOL0
+   10 CONTINUE
+      RETURN
+      END