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DOUBLE PRECISION FUNCTION anorm2(a,n)
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INTEGER n
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DOUBLE PRECISION a(n,n)
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INTEGER i,j
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DOUBLE PRECISION sum
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sum=0.d0
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do 12 j=1,n
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do 11 i=1,n
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sum=sum+a(i,j)**2
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11 continue
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12 continue
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anorm2=sqrt(sum)/n
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return
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END
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