chemometrics (version 1.4.1)

plotsom: Plot SOM results

Description

Plot results of Self Organizing Maps (SOM).

Usage

plotsom(obj, grp, type = c("num", "bar"), margins = c(3,2,2,2), ...)

Arguments

obj

result object from som

grp

numeric vector or factor with group information

type

type of presentation for output, see details

margins

plot margins for output, see par

...

additional graphics parameters, see par

Value

Details

The results of Self Organizing Maps (SOM) are plotted either in a table with numbers (type="num") or with barplots (type="bar"). There is a limitation to at most 9 groups. A summary table is returned.

References

K. Varmuza and P. Filzmoser: Introduction to Multivariate Statistical Analysis in Chemometrics. CRC Press, Boca Raton, FL, 2009.

See Also

som

Examples

data(glass)
require(som)
Xs <- scale(glass)
Xn <- Xs/sqrt(apply(Xs^2,1,sum))
X_SOM <- som(Xn,xdim=4,ydim=4) # 4x4 fields
data(glass.grp)
res <- plotsom(X_SOM,glass.grp,type="bar")