Functions:
=========
bpca.default         Biplot for `data.frame' or `matrix' objects.
bpca.prcomp          Biplot for `prcomp' objects.
bpca                 Main function (S3 based).
dt.tools             Calculates vector variable lengths, angles between vector
                     variables and variable correlations from `data.frame' or
                     `matrix' objects.
plot.bpca.2d         Plots `bpca.2d' objects with the package `graphics'.
plot.bpca.3d         Plots `bpca.3d' objects with the packages `scatterplot3d'
                     (`graphics' based) and `rgl' (OpenGL based).
plot.qbpca           Plots `qbpca' objects with the package `graphics'.

print.xtable         Creates generic print.xtable
print.xtable.bpca    Prints `xtable.bpca' objects.
print.xtable.default Prints `xtable' objects.
qbpca                Evaluates the quality of the biplot representation for
                     `bpca.2d' and `bpca.3d' objects.
summary.bpca         Summarizes `bpca' (`bpca.2d' and `bpca.3d') objects.
var.rbf              Calculates the matrix of graphical correlations projected
                     by the biplot for `bpca.2d' and `bpca.3d' objects.
var.rdf              Calculates the matrix of `poor' graphical correlations,
                     represented by the biplot, for `bpca.2d' and `bpca_3d'
                     objects.
xtable.bpca          Creates xtable method to bpca objects.           

Datasets:
========
gabriel1971   Percentages of households having various facilities and
              appliances in East Jerusalem Arab areas, by quarters of
              the town.
gge2003       A didactic matrix of genotypes (rows) and environments
              (columns).
marina        Cinematografique production of Brazil between 2007 and 2011.
ontario       Ontario winter wheat (1993).
