mp (version 0.4.1)

lamp: Local Affine Multidimensional Projection

Description

Creates a 2D representation of the data. Requires a subsample (sample.indices) and its 2D representation (Ys).

Usage

lamp(X, sample.indices = NULL, Ys = NULL, cp = 1)

Arguments

X

A data frame or matrix.

sample.indices

The indices of data points in X used as subsamples. If not given, some points from X will be randomly selected and Ys will be generated by calling forceScheme on them.

Ys

Initial 2D configuration of the data subsamples (will be ignored if sample.indices is NULL). Scaling the columns to [-0.5, 0.5] is recommended to avoid scaling problems.

cp

Proportion of nearest control points to be used.

Value

The 2D representation of the data.

References

Joia, P.; Paulovich, F.V.; Coimbra, D.; Cuminato, J.A.; Nonato, L.G., "Local Affine Multidimensional Projection," Visualization and Computer Graphics, IEEE Transactions on , vol.17, no.12, pp.2563,2571, Dec. 2011

Examples

# Iris example
emb <- lamp(iris[, 1:4])
plot(emb, col=iris$Species)