V3FIT
LIBSTELL
Sources
Lsode
vnorm.f
1
FUNCTION
vnorm (n, v, w)
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USE
stel_kinds
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IMPLICIT NONE
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C-----------------------------------------------
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C D u m m y A r g u m e n t s
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C-----------------------------------------------
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INTEGER
n
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REAL
(rprec),
DIMENSION(n)
:: v, w
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C-----------------------------------------------
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C L o c a l V a r i a b l e s
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C-----------------------------------------------
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REAL
(rprec) :: sum0, vnorm
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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 vnorm = SQRT( (1/n) * SUM( v(i)*w(i) )**2 )
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c-----------------------------------------------------------------------
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sum0 = sum((v*w)**2)
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vnorm = sqrt(sum0/(n))
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END FUNCTION
vnorm
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