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view libcruft/odepack/vnorm.f @ 13741:b0e70a71647b stable release-3-4-3

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Version 3.4.3 released. * configure.ac (AC_INIT): Version number is now 3.4.3. (OCTAVE_RELEASE_DATE): Update to 2011-10-10.
author John W. Eaton <jwe@octave.org>
date Mon, 10 Oct 2011 10:23:45 -0400
parents 30c606bec7a8
children
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      DOUBLE PRECISION FUNCTION VNORM (N, V, W)
CLLL. OPTIMIZE
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   VNORM = SQRT( (1/N) * SUM( V(I)*W(I) )**2 )
C-----------------------------------------------------------------------
      INTEGER N,   I
      DOUBLE PRECISION V, W,   SUM
      DIMENSION V(N), W(N)
      SUM = 0.0D0
      DO 10 I = 1,N 
 10     SUM = SUM + (V(I)*W(I))**2
      VNORM = DSQRT(SUM/DBLE(N))      
      RETURN
C----------------------- END OF FUNCTION VNORM -------------------------
      END