names of variables that shall be used for calculation of distance. By default these are all variables present in `data` and `observation`
distance
the distance function, by default the `gower_dist` function.
n
number of neighbours to select
frac
if `n` is not specified (NULL), then will be calculated as `frac` * number of rows in `data`. Either `n` or `frac` need to be specified.
Value
a data frame with selected rows
Details
Note that select_neighbours function is S3 generic.
If you want to work on non standard data sources (like H2O ddf, external databases)
you should overload it.