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61 lines
1.9 KiB
Fortran
61 lines
1.9 KiB
Fortran
*DECK DDASLV
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SUBROUTINE DDASLV (NEQ, DELTA, WM, IWM)
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C***BEGIN PROLOGUE DDASLV
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C***SUBSIDIARY
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C***PURPOSE Linear system solver for DDASSL.
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C***LIBRARY SLATEC (DASSL)
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C***TYPE DOUBLE PRECISION (SDASLV-S, DDASLV-D)
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C***AUTHOR Petzold, Linda R., (LLNL)
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C***DESCRIPTION
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C-----------------------------------------------------------------------
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C THIS ROUTINE MANAGES THE SOLUTION OF THE LINEAR
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C SYSTEM ARISING IN THE NEWTON ITERATION.
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C MATRICES AND REAL TEMPORARY STORAGE AND
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C REAL INFORMATION ARE STORED IN THE ARRAY WM.
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C INTEGER MATRIX INFORMATION IS STORED IN
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C THE ARRAY IWM.
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C FOR A DENSE MATRIX, THE LINPACK ROUTINE
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C DGESL IS CALLED.
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C FOR A BANDED MATRIX,THE LINPACK ROUTINE
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C DGBSL IS CALLED.
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C-----------------------------------------------------------------------
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C***ROUTINES CALLED DGBSL, DGESL
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C***REVISION HISTORY (YYMMDD)
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C 830315 DATE WRITTEN
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C 901009 Finished conversion to SLATEC 4.0 format (F.N.Fritsch)
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C 901019 Merged changes made by C. Ulrich with SLATEC 4.0 format.
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C 901026 Added explicit declarations for all variables and minor
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C cosmetic changes to prologue. (FNF)
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C***END PROLOGUE DDASLV
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C
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INTEGER NEQ, IWM(*)
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DOUBLE PRECISION DELTA(*), WM(*)
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C
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EXTERNAL DGBSL, DGESL
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C
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INTEGER LIPVT, LML, LMU, LMTYPE, MEBAND, MTYPE, NPD
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PARAMETER (NPD=1)
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PARAMETER (LML=1)
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PARAMETER (LMU=2)
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PARAMETER (LMTYPE=4)
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PARAMETER (LIPVT=21)
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C
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C***FIRST EXECUTABLE STATEMENT DDASLV
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MTYPE=IWM(LMTYPE)
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GO TO(100,100,300,400,400),MTYPE
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C
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C DENSE MATRIX
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100 CALL DGESL(WM(NPD),NEQ,NEQ,IWM(LIPVT),DELTA,0)
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RETURN
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C
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C DUMMY SECTION FOR MTYPE=3
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300 CONTINUE
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RETURN
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C
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C BANDED MATRIX
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400 MEBAND=2*IWM(LML)+IWM(LMU)+1
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CALL DGBSL(WM(NPD),MEBAND,NEQ,IWM(LML),
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* IWM(LMU),IWM(LIPVT),DELTA,0)
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RETURN
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C------END OF SUBROUTINE DDASLV------
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END
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