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72 lines
2.8 KiB
Fortran
72 lines
2.8 KiB
Fortran
*DECK DSMMTI
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SUBROUTINE DSMMTI (N, B, X, NELT, IA, JA, A, ISYM, RWORK, IWORK)
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C***BEGIN PROLOGUE DSMMTI
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C***PURPOSE SLAP MSOLVE for LDU Factorization of Normal Equations.
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C This routine acts as an interface between the SLAP generic
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C MMTSLV calling convention and the routine that actually
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C -1
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C computes [(LDU)*(LDU)'] 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 (SSMMTI-S, DSMMTI-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 DSMMI2:
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C IWORK(1) = Starting location of IL in IWORK.
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C IWORK(2) = Starting location of JL in IWORK.
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C IWORK(3) = Starting location of IU in IWORK.
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C IWORK(4) = Starting location of JU in IWORK.
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C IWORK(5) = Starting location of L in RWORK.
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C IWORK(6) = Starting location of DINV in RWORK.
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C IWORK(7) = Starting location of U in RWORK.
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C See the DESCRIPTION of DSMMI2 for details.
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C***REFERENCES (NONE)
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C***ROUTINES CALLED DSMMI2
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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 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 DSMMTI
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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(N), RWORK(*), X(N)
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INTEGER IA(NELT), IWORK(10), JA(NELT)
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C .. Local Scalars ..
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INTEGER LOCDIN, LOCIL, LOCIU, LOCJL, LOCJU, LOCL, LOCU
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C .. External Subroutines ..
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EXTERNAL DSMMI2
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C***FIRST EXECUTABLE STATEMENT DSMMTI
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C
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C Pull out the locations of the arrays holding the ILU
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C factorization.
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C
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LOCIL = IWORK(1)
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LOCJL = IWORK(2)
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LOCIU = IWORK(3)
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LOCJU = IWORK(4)
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LOCL = IWORK(5)
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LOCDIN = IWORK(6)
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LOCU = IWORK(7)
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C
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CALL DSMMI2(N, B, X, IWORK(LOCIL), IWORK(LOCJL),
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$ RWORK(LOCL), RWORK(LOCDIN), IWORK(LOCIU),
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$ IWORK(LOCJU), RWORK(LOCU))
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C
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RETURN
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C------------- LAST LINE OF DSMMTI FOLLOWS ----------------------------
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END
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