pca_biplot: PCA biplot

In specmine: Metabolomics and Spectral Data Analysis and Mining

PCA biplot

Description

Draws a PCA biplot for a prcomp or princomp result.

Usage

pca_biplot(
  dataset,
  pca.result,
  cex = 0.8,
  legend.cex = 0.8,
  x.colors = 1,
  inset = c(0, 0),
  legend.place = "topright",
  ...
)

Arguments

dataset	Dataset used in the PCA.
pca.result	PCA result object.
cex	Text expansion factor.
legend.cex	Legend text size.
x.colors	Colour vector or metadata column name.
inset	Legend inset.
legend.place	Legend position.
...	Additional arguments passed to the plotting method.

Value

No return value, called for its side effect of plotting.

Examples

datamat <- matrix(
  rnorm(20),
  nrow = 4,
  dimnames = list(paste0("x", 1:4), paste0("s", 1:5))
)
metadata <- data.frame(class = factor(c("A", "A", "B", "B", "A")))
dataset <- list(data = datamat, metadata = metadata)
pca_res <- pca_analysis_dataset(dataset)
pca_biplot(dataset, pca_res)

specmine documentation built on Aug. 5, 2026, 5:06 p.m.