Mercurial > hg > octave-lyh

view libcruft/odepack/vnorm.f @ 8269:37afdd1d1bf8

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Use FT2_CFLAGS when checking for FTGL headers. The flags need added to both CXXFLAGS and CPPFLAGS to pass all of AC_CHECK_HEADERS's tests.
author Jason Riedy <jason@acm.org>
date Thu, 23 Oct 2008 09:51:21 -0400
parents 30c606bec7a8
children
line wrap: on
line source

      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