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42 lines
1.3 KiB
Fortran
42 lines
1.3 KiB
Fortran
*DECK VNWRMS
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REAL FUNCTION VNWRMS (N, V, W)
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C***BEGIN PROLOGUE VNWRMS
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C***SUBSIDIARY
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C***PURPOSE Subsidiary to DEBDF
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C***LIBRARY SLATEC
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C***TYPE SINGLE PRECISION (VNWRMS-S, DVNRMS-D)
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C***AUTHOR (UNKNOWN)
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C***DESCRIPTION
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C
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C VNWRMS computes a weighted root-mean-square vector norm for the
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C integrator package DEBDF.
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C
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C***SEE ALSO DEBDF
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C***ROUTINES CALLED (NONE)
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C***REVISION HISTORY (YYMMDD)
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C 800901 DATE WRITTEN
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C 890531 Changed all specific intrinsics to generic. (WRB)
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C 890831 Modified array declarations. (WRB)
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C 891214 Prologue converted to Version 4.0 format. (BAB)
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C 900328 Added TYPE section. (WRB)
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C***END PROLOGUE VNWRMS
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C
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C
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CLLL. OPTIMIZE
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C-----------------------------------------------------------------------
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C THIS FUNCTION ROUTINE COMPUTES THE WEIGHTED ROOT-MEAN-SQUARE NORM
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C OF THE VECTOR OF LENGTH N CONTAINED IN THE ARRAY V, WITH WEIGHTS
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C CONTAINED IN THE ARRAY W OF LENGTH N..
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C VNWRMS = SQRT( (1/N) * SUM( V(I)/W(I) )**2 )
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C-----------------------------------------------------------------------
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INTEGER N, I
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REAL V, W, SUM
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DIMENSION V(*), W(*)
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C***FIRST EXECUTABLE STATEMENT VNWRMS
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SUM = 0.0E0
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DO 10 I = 1,N
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10 SUM = SUM + (V(I)/W(I))**2
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VNWRMS = SQRT(SUM/N)
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RETURN
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C----------------------- END OF FUNCTION VNWRMS ------------------------
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END
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