is.euclid | R Documentation |
Confirmation of the Euclidean nature of a distance matrix by the Gower's theorem.
is.euclid
is used in summary.dist
.
is.euclid(distmat, plot = FALSE, print = FALSE, tol = 1e-07)
## S3 method for class 'dist'
summary(object, ...)
distmat |
an object of class 'dist' |
plot |
a logical value indicating whether the eigenvalues bar plot of the matrix of the term |
print |
a logical value indicating whether the eigenvalues of the matrix of the term |
tol |
a tolerance threshold : an eigenvalue is considered positive if it is larger than |
object |
an object of class 'dist' |
... |
further arguments passed to or from other methods |
returns a logical value indicating if all the eigenvalues are positive or equal to zero
Daniel Chessel
Stéphane Dray stephane.dray@univ-lyon1.fr
Gower, J.C. and Legendre, P. (1986) Metric and Euclidean properties of dissimilarity coefficients. Journal of Classification, 3, 5–48.
w <- matrix(runif(10000), 100, 100)
w <- dist(w)
summary(w)
is.euclid (w) # TRUE
w <- quasieuclid(w) # no correction need in: quasieuclid(w)
w <- lingoes(w) # no correction need in: lingoes(w)
w <- cailliez(w) # no correction need in: cailliez(w)
rm(w)
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