demo/dt-tools.R

In bpca: Biplot of Multivariate Data Based on Principal Components Analysis

##
## Computes: vector variable lengths, angles between vector variables and
## variable correlations from data.frame or matrix objects (n x p)
## n = rows (objects)
## p = columns (variables)
##

dt <- dt.tools(iris, 2) # No numeric columns are removed in dt.tools

# Exploring the object 'bp' created by the function 'var.tools'
class(dt)
names(dt)
str(dt)

dt$length
dt$angle
dt$r
dt

# Checking the determinations
(iris.tools <- round(dt.tools(iris,
                              center=2)$r,
                     5))

(iris.obsv  <- round(cor(iris[-5]),
                     5))

all(iris.tools == iris.obsv)