| sizeDiss {cluster} | R Documentation |
Returns the number of observations (sample size) corresponding to a dissimilarity like object, or equivalently, the number of rows or columns of a matrix when only the lower or upper triangular part (without diagonal) is given.
It is nothing else but the inverse function of f(n) = n(n-1)/2.
sizeDiss(d)
d |
any R object with length (typically) n(n-1)/2. |
a number; n if length(d) == n(n-1)/2, NA otherwise.
dissimilarity.object and also
as.dist for class dissimilarity and
dist objects which have a Size attribute.
sizeDiss(1:10)# 5, since 10 == 5 * (5 - 1) / 2 sizeDiss(1:9) # NA n <- 1:100 stopifnot(n == sapply( n*(n-1)/2, function(n) sizeDiss(logical(n))))