# varUsed

From randomForest v4.6-14
by Andy Liaw

##### Variables used in a random forest

Find out which predictor variables are actually used in the random forest.

- Keywords
- tree

##### Usage

`varUsed(x, by.tree=FALSE, count=TRUE)`

##### Arguments

- x
An object of class

`randomForest`

.- by.tree
Should the list of variables used be broken down by trees in the forest?

- count
Should the frequencies that variables appear in trees be returned?

##### Value

If `count=TRUE`

and `by.tree=FALSE`

, a integer vector containing
frequencies that variables are used in the forest. If
`by.tree=TRUE`

, a matrix is returned, breaking down the counts by
tree (each column corresponding to one tree and each row to a variable).

If `count=FALSE`

and `by.tree=TRUE`

, a list of integer
indices is returned giving the variables used in the trees, else if
`by.tree=FALSE`

, a vector of integer indices giving the
variables used in the entire forest.

##### See Also

##### Examples

```
# NOT RUN {
data(iris)
set.seed(17)
varUsed(randomForest(Species~., iris, ntree=100))
# }
```

*Documentation reproduced from package randomForest, version 4.6-14, License: GPL (>= 2)*

### Community examples

Looks like there are no examples yet.