dist.quant {ade4} | R Documentation |
computes on quantitative variables, some distance matrices as canonical, Joreskog and Mahalanobis.
dist.quant(df, method = NULL, diag = FALSE, upper = FALSE, tol = 1e-07)
df |
a data frame containing only quantitative variables |
method |
an integer between 1 and 3. If NULL the choice is made with a console message. See details |
diag |
a logical value indicating whether the diagonal of the distance matrix should be printed by `print.dist' |
upper |
a logical value indicating whether the upper triangle of the distance matrix should be printed by `print.dist' |
tol |
used in case 3 of method as a tolerance threshold for null eigenvalues |
All the distances are of type d = ||x-y||_A = sqrt((x-y)^t A (x-y))
an object of class dist
Daniel Chessel chessel@biomserv.univ-lyon1.fr
Stéphane Dray dray@biomserv.univ-lyon1.fr
data(ecomor) par(mfrow = c(2,2)) scatter(dudi.pco(dist.quant(ecomor$morpho,3), scan = FALSE)) scatter(dudi.pco(dist.quant(ecomor$morpho,2), scan = FALSE)) scatter(dudi.pco(dist(scalewt(ecomor$morpho)), scan = FALSE)) scatter(dudi.pco(dist.quant(ecomor$morpho,1), scan = FALSE)) par(mfrow = c(1,1))