visible: Set or query the visibility of observations
Description
There is a column .visible to control the visibility of observations.
This can be useful for ``deleting'' certain observations from the plot (set
their visibility to FALSE).
Usage
visible(data)
visible(data) <- value
Arguments
data
the mutaframe
value
a logical vector of the length nrow(data)
Value
The function visible returns the logical vector to
control the visibility of observations