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double precision function fnorm (n, a, w)
clll. optimize
c-----------------------------------------------------------------------
c this function computes the norm of a full n by n matrix,
c stored in the array a, that is consistent with the weighted max-norm
c on vectors, with weights stored in the array w..
c fnorm = max(i=1,...,n) ( w(i) * sum(j=1,...,n) abs(a(i,j))/w(j) )
c-----------------------------------------------------------------------
integer n, i, j
double precision a, w, an, sum
dimension a(n,n), w(n)
an = 0.0d0
do 20 i = 1,n
sum = 0.0d0
do 10 j = 1,n
10 sum = sum + dabs(a(i,j))/w(j)
an = dmax1(an,sum*w(i))
20 continue
fnorm = an
return
c----------------------- end of function fnorm -------------------------
end
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