Format aesthetics for the class or group means

This function allows the user to format the aesthetics for the class means or group means.

means (bp,  which = NULL, col = NULL, pch = 15, cex = 1, label = FALSE,
label.col = NULL,label.cex = 0.75, label.side = "bottom", label.offset = 0.5,
opacity = 1, shade.darker = TRUE)

Arguments

bp

an object of class biplot.

which

a vector containing the groups or classes for which the means should be displayed, with default bp$g.

col

the colour(s) for the means, with default as the colour of the samples.

pch

the plotting character(s) for the means, with default 15.

cex

the character expansion(s) for the means, with default 1.

label

a logical value indicating whether the means should be labelled, with default TRUE.

label.col

a vector of the same length as which with label colours for the means, with default as the colour of the means.

label.cex

a vector of the same length as which with label text expansions for the means, with default 0.75.

label.side

the side at which the label of the plotted mean point appears, with default bottom. Note that unlike the argument pos in text(), options are "bottom", "left", "top", "right" and not 1, 2, 3, 4.

label.offset

the offset of the label from the plotted mean point. See ?text for a detailed explanation of the argument offset.

opacity

transparency of means.

shade.darker

a logical value indicating whether the colour of the mean points should be made a shade darker than the default or specified colour, with default TRUE.

Value

The object of class biplot will be appended with a list called means containing the following elements:

which

a vector containing the groups or classes for which the means are displayed.

col

the colour(s) of the means.

pch

the plotting character(s) of the means.

cex

the character expansion(s) of the plotting character(s) of the means.

label

a logical value indicating whether means are labelled.

label.col

the label colours of the means.

label.cex

the label text expansions of the samples.

label.side

the side at which the label of the plotted mean point appears.

label.offset

the offset of the label from the plotted mean point.

opacity

the opacity level of the plotted points.

Details

The number of classes or groups (defined by group.aes) is indicated as g. If an argument is not of length g, recycling is used.

See also

biplot()

Examples

biplot(iris[,1:4]) |> PCA() |>
          means(col = "purple", pch = 15, cex = 2) |> plot()