Extract.factor | R Documentation |

Extract or replace subsets of factors.

## S3 method for class 'factor' x[..., drop = FALSE] ## S3 method for class 'factor' x[[...]] ## S3 replacement method for class 'factor' x[...] <- value ## S3 replacement method for class 'factor' x[[...]] <- value

`x` |
a factor |

`...` |
a specification of indices – see |

`drop` |
logical. If true, unused levels are dropped. |

`value` |
character: a set of levels. Factor values are coerced to character. |

When unused levels are dropped the ordering of the remaining levels is preserved.

If `value`

is not in `levels(x)`

, a missing value is
assigned with a warning.

Any `contrasts`

assigned to the factor are preserved
unless `drop = TRUE`

.

The `[[`

method supports argument `exact`

.

A factor with the same set of levels as `x`

unless `drop = TRUE`

.

`factor`

, `Extract`

.

## following example(factor) (ff <- factor(substring("statistics", 1:10, 1:10), levels = letters)) ff[, drop = TRUE] factor(letters[7:10])[2:3, drop = TRUE]

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