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36 lines
1.1 KiB
Fortran
36 lines
1.1 KiB
Fortran
*DECK DVNRMS
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DOUBLE PRECISION FUNCTION DVNRMS (N, V, W)
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C***BEGIN PROLOGUE DVNRMS
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C***SUBSIDIARY
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C***PURPOSE Subsidiary to DDEBDF
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C***LIBRARY SLATEC
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C***TYPE DOUBLE 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 DVNRMS computes a weighted root-mean-square vector norm for the
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C integrator package DDEBDF.
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C
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C***SEE ALSO DDEBDF
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C***ROUTINES CALLED (NONE)
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C***REVISION HISTORY (YYMMDD)
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C 820301 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 890911 Removed unnecessary intrinsics. (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 DVNRMS
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INTEGER I, N
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DOUBLE PRECISION SUM, V, W
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DIMENSION V(*),W(*)
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C***FIRST EXECUTABLE STATEMENT DVNRMS
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SUM = 0.0D0
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DO 10 I = 1, N
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SUM = SUM + (V(I)/W(I))**2
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10 CONTINUE
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DVNRMS = SQRT(SUM/N)
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RETURN
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C ----------------------- END OF FUNCTION DVNRMS
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C ------------------------
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END
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