Description Usage Arguments Details Value Author(s) References See Also Examples

Substracts the $i$th cases of `x`

along each level of factor `y`

. The function is useful for vectorized data, vhen items are repeated in known sequences.

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`x` |
a vector to be substracted. |

`y` |
a vector which is used to determine repeating sequences of the valoes of |

`i` |
numeric, determines position of values taken from |

`na.rm` |
logical, shoulr NAs removed from the result? The removel of NAs takes place befor subtsracting. |

`x`

and `y`

should be of the same lengths.

A vector with length same as number of levels, or unique values in `y`

. If `na.rm = TRUE`

, it can be shorter, because the removal of NA values takes place prior to substracting. Names of the result is same as levels of `y`

.

P\'eter S\'olymos, solymos@ualberta.ca

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