Description Usage Arguments Details Value Examples

One subset consists of 'subset_size' unique groups and thus of all rows which in 'data' which have any of these groups. The last subset might have less groups, if the number of unique groups is not dividable by subset_size.

1 |

`data` |
Data.frame whose subsets to use on FUN |

`indices` |
Vector of group assignments, same length as nrow(data) |

`subset_size` |
Number of groups to use in one subset |

`FUN` |
Function applied to subsets of data |

`sort_indices` |
Sort groups (by their sorted character(!) names) before building subsets |

`...` |
More arguments to FUN |

FUN is applied on each subset.

list of function result (one entry for each subset)

1 2 | ```
byX(data.frame(d=1:10), 1:10, 2, sum)
``` |

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