plot_mbcfit: Plot Fitted Mixture Models

In qcluster: Clustering via Quadratic Scoring

Plot Fitted Mixture Models

Description

This function provides a plot method for objects of class mbcfit, returned as output by the gmix function. It serves as a wrapper around plot_clustering, allowing easy visualization of clustering results, including clustering assignments, contours, and boundaries.

Usage

## S3 method for class 'mbcfit'
plot(x, data = NULL, subset = NULL,
                      what = c("clustering", "contour"),
                      col_cl = NULL, pch_cl = NULL, ...)

Arguments

x	An object of class mbcfit, typically a result of the gmix function.
data	NULL or a data matrix, data frame, or array containing data points to be plotted. See Details.
subset	A numeric vector indexing columns of data to subset and focus the plot on specific features. Default is NULL.
what	Character vector specifying which elements to plot. Options are "clustering", "contour", and "boundary". Default is to plot "clustering" and "boundary". See Details.
col_cl	A vector of colors to use for clusters (one for each cluster). Default is NULL, which uses a default sequence of colors.
pch_cl	A vector of plotting symbols (one for each cluster) to use for clusters. Default is NULL, which uses a default sequence of symbols.
...	Further arguments passed to or from other methods.

Details

The plot.mbcfit function provides a plotting method for objects of the class mbcfit. It acts as a wrapper around the plot_clustering function, allowing users to easily generate various plots to analyze the clustering results. A plot is produced only upon a successful mbcfit estimate, i.e., when mbcfit has code equal to either 1 or 2.

When data is NULL (the default), the function plots only contour sets (and optionally clustering boundaries) for the estimated mixture density components, using the params information from the mbcfit object. When data is not NULL, the function additionally plots data points and their hard clustering labels, which are obtained using mbcfit to predict the cluster labels (see predict.mbcfit).

Value

A plot displaying the data with clustering information, contours, and/or boundaries, depending on the specified what argument.

See Also

gmix, plot_clustering, link{predict.mbcfit}

Examples

# load data
data("banknote")
dat <- banknote[-1]

# fit 2 clusters
set.seed(123)
fit <- gmix(dat, K = 2, init.nstart = 1)
print(fit)

# plot partition (default)
plot(x = fit, data = dat)


# plot partition onto the first 3 coordinates
plot(x = fit, data = dat, subset = c(1:3), pch_cl = c("A", "B"),
     col_cl = c("#4285F4", "#0F9D58"), what = "clustering")

# additionally plot clustering boundary and contour sets
plot(x = fit, data = dat, subset = c(1:3), pch_cl = c("A", "B"),
     col_cl = c("#4285F4", "#0F9D58"), what = c("clustering", "boundary", "contour"))

qcluster documentation built on April 3, 2025, 6:16 p.m.