R: Plot SOM results

plotsom {chemometrics} | R Documentation

## 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`

### 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.

### Value

`sumtab` | Summary table

### Author(s)

Peter Filzmoser <P.Filzmoser@tuwien.ac.at>

### 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")

[Package chemometrics version 1.4.2 Index]