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79 lines
2.4 KiB
79 lines
2.4 KiB
C Copyright(C) 1999-2020 National Technology & Engineering Solutions
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C of Sandia, LLC (NTESS). Under the terms of Contract DE-NA0003525 with
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C NTESS, the U.S. Government retains certain rights in this software.
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C
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C See packages/seacas/LICENSE for details
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SUBROUTINE NXKBDY (MDIM, NNXK, NPELEM, NXK, KKK, LIST, THREE,
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& EIGHT, NINE)
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C***********************************************************************
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C SUBROUTINE NXKBDY = FLAGS ALL SIDES OF ELEMENTS ONLY ONCE BY USE OF
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C A HASH SCHEME
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C***********************************************************************
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C NXK = THE NODES PER ELEMENT ARRAY (CONNECTIVITY)
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C (A NEGATIVE VALUE WILL INDICATE UNIQUENESS OF FOLLOWING
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C SIDE)
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C***********************************************************************
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LOGICAL THREE, EIGHT, NINE, ITSOK
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DIMENSION NXK (NNXK, NPELEM), LIST (MDIM)
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DO 100 I = 1, MDIM
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LIST (I) = 0
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100 CONTINUE
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DO 140 K = 1, KKK
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IF ((NXK (3, K) .EQ. 0) .AND. (THREE)) THEN
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ITSOK = .TRUE.
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NEND = 1
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ELSEIF ((NXK (3, K) .NE. 0) .AND. ((EIGHT) .OR. (NINE))) THEN
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ITSOK = .TRUE.
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NEND = 4
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ELSE
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ITSOK = .FALSE.
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ENDIF
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IF (ITSOK) THEN
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DO 130 N = 1, NEND
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C COMPUTE HASH CODE FOR LINE
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N2 = N + 1
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IF (N .GE. 4)N2 = 1
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NODE1 = NXK (N, K)
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NODE2 = IABS (NXK (N2, K))
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IF (NODE2 .GT. NODE1) THEN
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LVAL = NODE1 * 100000 + NODE2
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ELSE
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LVAL = NODE2 * 100000 + NODE1
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ENDIF
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C CALCULATE THE BEGINNING HASH VALUE
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HOLD = DBLE(NODE1 + NODE2) * 3.1830989
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LHASH = INT((HOLD-INT (HOLD)) * DBLE(MDIM) + 1)
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LKEEP = LHASH
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C FIRST-TIMERS CLAIM THE NODE
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110 CONTINUE
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IF (LIST (LHASH).NE.0) THEN
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IF (LIST (LHASH) .EQ. LVAL) GOTO 120
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LHASH = LHASH + 1
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IF (LHASH .EQ. MDIM) LHASH = 1
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IF (LHASH.NE.LKEEP) GOTO 110
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CALL MESSAGE('HASH SCHEME OVERFLOW IN KXNBDY')
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STOP
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ENDIF
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LIST (LHASH) = LVAL
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NXK (N, K) = ISIGN (NXK (N, K), -1)
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120 CONTINUE
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130 CONTINUE
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ENDIF
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140 CONTINUE
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RETURN
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END
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