discriminant_projector: Construct a Discriminant Projector

In bbuchsbaum/multivarious: Extensible Data Structures for Multivariate Analysis

Construct a Discriminant Projector

Description

A discriminant_projector is an instance that extends bi_projector with a projection that maximizes class separation. This can be useful for dimensionality reduction techniques that take class labels into account, such as Linear Discriminant Analysis (LDA).

Usage

discriminant_projector(
  v,
  s,
  sdev,
  preproc = prep(pass()),
  labels,
  classes = NULL,
  ...
)

Arguments

v	The projection matrix (often X %*% v). Rows correspond to observations, columns to components.
s	The score matrix (often X %*% v). Rows correspond to observations, columns to components.
sdev	The standard deviations associated with the scores or components (e.g., singular values from LDA).
preproc	A prepper or pre_processor object, or a pre-processing function (e.g., center, pass).
labels	A factor or character vector of class labels corresponding to the rows of X (and s).
classes	Additional S3 classes to prepend.
...	Extra arguments passed to bi_projector.

Value

A discriminant_projector object.

See Also

bi_projector

Examples

# Simulate data and labels
set.seed(123)
X <- matrix(rnorm(100 * 10), 100, 10)
labels <- factor(rep(1:2, each = 50))

# Perform LDA and create a discriminant projector
lda_fit <- MASS::lda(X, labels)

dp <- discriminant_projector(lda_fit$scaling, X %*% lda_fit$scaling, sdev = lda_fit$svd, 
labels = labels)

bbuchsbaum/multivarious documentation built on July 16, 2025, 11:04 p.m.