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43 lines
1.5 KiB
Fortran
43 lines
1.5 KiB
Fortran
*DECK DDAWTS
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SUBROUTINE DDAWTS (NEQ, IWT, RTOL, ATOL, Y, WT, RPAR, IPAR)
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C***BEGIN PROLOGUE DDAWTS
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C***SUBSIDIARY
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C***PURPOSE Set error weight vector for DDASSL.
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C***LIBRARY SLATEC (DASSL)
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C***TYPE DOUBLE PRECISION (SDAWTS-S, DDAWTS-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 SUBROUTINE SETS THE ERROR WEIGHT VECTOR
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C WT ACCORDING TO WT(I)=RTOL(I)*ABS(Y(I))+ATOL(I),
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C I=1,-,N.
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C RTOL AND ATOL ARE SCALARS IF IWT = 0,
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C AND VECTORS IF IWT = 1.
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C-----------------------------------------------------------------------
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C***ROUTINES CALLED (NONE)
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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 DDAWTS
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C
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INTEGER NEQ, IWT, IPAR(*)
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DOUBLE PRECISION RTOL(*), ATOL(*), Y(*), WT(*), RPAR(*)
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C
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INTEGER I
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DOUBLE PRECISION ATOLI, RTOLI
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C
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C***FIRST EXECUTABLE STATEMENT DDAWTS
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RTOLI=RTOL(1)
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ATOLI=ATOL(1)
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DO 20 I=1,NEQ
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IF (IWT .EQ.0) GO TO 10
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RTOLI=RTOL(I)
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ATOLI=ATOL(I)
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10 WT(I)=RTOLI*ABS(Y(I))+ATOLI
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20 CONTINUE
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RETURN
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C-----------END OF SUBROUTINE DDAWTS------------------------------------
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END
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