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Constant sum
Closes compositions to sum up to a given constant (default 1), by
     dividing each part of a composition by its row sum. 
constSum(x, const=1)
multivariate data ideally of class data.frame or matrix
constant, the default equals 1.
The data for which the row sums are equal to \code{const}.
Matthias Templ
constSum(expenditures, 100)
\keyword{ manip }
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