
Confirmation of the Euclidean nature of a distance matrix by the Gower's theorem.
IsEuclid
is used in summary.dist
.
IsEuclid(distmat, plot = FALSE, print = FALSE, tol = 1e-07)
an object of class 'dist'
a logical value indicating whether the eigenvalues bar plot of the matrix of the term
a logical value indicating whether the eigenvalues of the matrix of the term
a tolerance threshold : an eigenvalue is considered positive if it is larger than -tol*lambda1
where lambda1
is the largest eigenvalue.
returns a logical value indicating if all the eigenvalues are positive or equal to zero
Gower, J.C. and Legendre, P. (1986) Metric and Euclidean properties of dissimilarity coefficients. Journal of Classification, 3, 5--48.
# NOT RUN {
w <- matrix(runif(10000), 100, 100)
w <- dist(w)
summary(w)
IsEuclid (w) # TRUE
# }
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