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view liboctave/cruft/odepack/svnorm.f @ 20654:b65888ec820e draft default tip gccjit
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author | Stefan Mahr <dac922@gmx.de> |
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date | Fri, 27 Feb 2015 16:59:36 +0100 |
parents | 648dabbb4c6b |
children |
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REAL FUNCTION SVNORM (N, V, W) C***BEGIN PROLOGUE SVNORM C***SUBSIDIARY C***PURPOSE Weighted root-mean-square vector norm. C***TYPE SINGLE PRECISION (SVNORM-S, DVNORM-D) C***AUTHOR Hindmarsh, Alan C., (LLNL) C***DESCRIPTION C C This function routine computes the weighted root-mean-square norm C of the vector of length N contained in the array V, with weights C contained in the array W of length N: C SVNORM = SQRT( (1/N) * SUM( V(i)*W(i) )**2 ) C C***SEE ALSO SLSODE C***ROUTINES CALLED (NONE) C***REVISION HISTORY (YYMMDD) C 791129 DATE WRITTEN C 890501 Modified prologue to SLATEC/LDOC format. (FNF) C 890503 Minor cosmetic changes. (FNF) C 930809 Renamed to allow single/double precision versions. (ACH) C***END PROLOGUE SVNORM C**End INTEGER N, I REAL V, W, SUM DIMENSION V(N), W(N) C C***FIRST EXECUTABLE STATEMENT SVNORM SUM = 0.0E0 DO 10 I = 1,N 10 SUM = SUM + (V(I)*W(I))**2 SVNORM = SQRT(SUM/N) RETURN C----------------------- END OF FUNCTION SVNORM ------------------------ END