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63 lines
2.5 KiB
Fortran
63 lines
2.5 KiB
Fortran
*DECK DSLLTI
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SUBROUTINE DSLLTI (N, B, X, NELT, IA, JA, A, ISYM, RWORK, IWORK)
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C***BEGIN PROLOGUE DSLLTI
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C***PURPOSE SLAP MSOLVE for LDL' (IC) Factorization.
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C This routine acts as an interface between the SLAP generic
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C MSOLVE calling convention and the routine that actually
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C -1
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C computes (LDL') B = X.
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C***LIBRARY SLATEC (SLAP)
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C***CATEGORY D2E
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C***TYPE DOUBLE PRECISION (SSLLTI-S, DSLLTI-D)
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C***KEYWORDS ITERATIVE PRECONDITION, LINEAR SYSTEM SOLVE, SLAP, SPARSE
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C***AUTHOR Greenbaum, Anne, (Courant Institute)
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C Seager, Mark K., (LLNL)
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C Lawrence Livermore National Laboratory
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C PO BOX 808, L-60
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C Livermore, CA 94550 (510) 423-3141
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C seager@llnl.gov
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C***DESCRIPTION
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C It is assumed that RWORK and IWORK have initialized with
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C the information required for DLLTI2:
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C IWORK(1) = NEL
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C IWORK(2) = Starting location of IEL in IWORK.
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C IWORK(3) = Starting location of JEL in IWORK.
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C IWORK(4) = Starting location of EL in RWORK.
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C IWORK(5) = Starting location of DINV in RWORK.
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C See the DESCRIPTION of DLLTI2 for details.
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C***REFERENCES (NONE)
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C***ROUTINES CALLED DLLTI2
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C***REVISION HISTORY (YYMMDD)
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C 871119 DATE WRITTEN
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C 881213 Previous REVISION DATE
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C 890915 Made changes requested at July 1989 CML Meeting. (MKS)
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C 890922 Numerous changes to prologue to make closer to SLATEC
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C standard. (FNF)
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C 890929 Numerous changes to reduce SP/DP differences. (FNF)
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C 910411 Prologue converted to Version 4.0 format. (BAB)
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C 910502 Corrected conversion error. (FNF)
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C 920511 Added complete declaration section. (WRB)
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C 921113 Corrected C***CATEGORY line. (FNF)
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C 930701 Updated CATEGORY section. (FNF, WRB)
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C***END PROLOGUE DSLLTI
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C .. Scalar Arguments ..
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INTEGER ISYM, N, NELT
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C .. Array Arguments ..
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DOUBLE PRECISION A(NELT), B(*), RWORK(*), X(*)
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INTEGER IA(NELT), IWORK(*), JA(NELT)
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C .. Local Scalars ..
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INTEGER LOCDIN, LOCEL, LOCIEL, LOCJEL, NEL
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C .. External Subroutines ..
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EXTERNAL DLLTI2
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C***FIRST EXECUTABLE STATEMENT DSLLTI
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NEL = IWORK(1)
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LOCIEL = IWORK(3)
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LOCJEL = IWORK(2)
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LOCEL = IWORK(4)
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LOCDIN = IWORK(5)
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CALL DLLTI2(N, B, X, NEL, IWORK(LOCIEL), IWORK(LOCJEL),
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$ RWORK(LOCEL), RWORK(LOCDIN))
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C
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RETURN
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C------------- LAST LINE OF DSLLTI FOLLOWS ----------------------------
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END
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