grouping {Gviz} | R Documentation

## Grouping of annotation features

### Description

Many annotation tracks are actually composed of a number of grouped sub-features, for instance exons in a gene model. This man page highlights the use of grouping information to build informative annotation plots.

### Details

All track objects that inherit from class `AnnotationTrack` support the grouping feature. The information is usually passed on to the constructor function (for `AnnotationTrack` via the `groups` argument and for `GeneRegionTrack` objects via the `exon` argument) or automatically downloaded from an online annotation repository (`BiomartGeneRegionTrack`). Group membership is specified by a factor vector with as many items as there are annotation items in the track (i.e., the value of `length(track)`. Upon plotting, the grouped annotation features are displayed together and will not be separated in the stacking of track items.

### Author(s)

Florian Hahne

### See Also

`AnnotationTrack`

`BiomartGeneRegionTrack`

`GeneRegionTrack`

[Package Gviz version 1.36.2 Index]