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lvq1 {class}

Learning Vector Quantization 1
Package: 
class
Version: 
7.3-9

Description

Moves examples in a codebook to better represent the training set.

Usage

lvq1(x, cl, codebk, niter = 100 * nrow(codebk$x), alpha = 0.03)

Arguments

x
a matrix or data frame of examples
cl
a vector or factor of classifications for the examples
codebk
a codebook
niter
number of iterations
alpha
constant for training

Details

Selects niter examples at random with replacement, and adjusts the nearest example in the codebook for each.

Values

A codebook, represented as a list with components x and cl giving the examples and classes.

References

Kohonen, T. (1990) The self-organizing map. Proc. IEEE 78, 1464--1480.

Kohonen, T. (1995) Self-Organizing Maps. Springer, Berlin.

Ripley, B. D. (1996) Pattern Recognition and Neural Networks. Cambridge.

Venables, W. N. and Ripley, B. D. (2002) Modern Applied Statistics with S. Fourth edition. Springer.

See Also

lvqinit, olvq1, lvq2, lvq3, lvqtest

Examples

train <- rbind(iris3[1:25,,1], iris3[1:25,,2], iris3[1:25,,3])
test <- rbind(iris3[26:50,,1], iris3[26:50,,2], iris3[26:50,,3])
cl <- factor(c(rep("s",25), rep("c",25), rep("v",25)))
cd <- lvqinit(train, cl, 10)
lvqtest(cd, train)
cd0 <- olvq1(train, cl, cd)
lvqtest(cd0, train)
cd1 <- lvq1(train, cl, cd0)
lvqtest(cd1, train)

Documentation reproduced from package class, version 7.3-9. License: GPL-2 | GPL-3