Plot observations in the coordinate plane PC1-PC2.

Source: R/plot_obspc.R

This function plots the observations in the coordinate plane PC1-PC2.

plot_obspc(mod, lchar = 3, pch = 20, ...)

Arguments

mod

a prcomp or princomp object obtained from prcomp or princomp functions.

lchar

the number of first characters to identify points.

pch

an integer specifying a symbol or a single character to be used as the default in plotting points.

...

arguments to be passed to methods, such as graphical parameters (see par).

Value

The function returns a list with two elements, coordinate points for first and second dimensions.

Examples

# For a prcomp object
pca1 <- prcomp(USArrests, scale=TRUE)  # Example
plot_obspc(pca1) # Default plot

plot_obspc(pca1, lchar=3, col='blue', pch=8)  # Customized plot


# For a princomp object
pca2 <- princomp(x=USArrests, cor=TRUE)
plot_obspc(pca2, col='red', ylim=c(-4, 4), xlim=c(-4, 4))