tally_ {dplyr} | R Documentation

## Deprecated SE versions of main verbs.

### Description

dplyr used to offer twin versions of each verb suffixed with an underscore. These versions had standard evaluation (SE) semantics: rather than taking arguments by code, like NSE verbs, they took arguments by value. Their purpose was to make it possible to program with dplyr. However, dplyr now uses tidy evaluation semantics. NSE verbs still capture their arguments, but you can now unquote parts of these arguments. This offers full programmability with NSE verbs. Thus, the underscored versions are now superfluous.

### Usage

    tally_(x, wt, sort = FALSE)

    count_(x, vars, wt = NULL, sort = FALSE)

    add_tally_(x, wt, sort = FALSE)

    add_count_(x, vars, wt = NULL, sort = FALSE)

    distinct_(.data, ..., .dots, .keep_all = FALSE)

    do_(.data, ..., .dots = list())

    funs_(dots, args = list(), env = base_env())

    group_by_(.data, ..., .dots = list(), add = FALSE)

    group_indices_(.data, ..., .dots = list())

    filter_(.data, ..., .dots = list())

    slice_(.data, ..., .dots = list())

    summarise_(.data, ..., .dots = list())

    summarize_(.data, ..., .dots = list())

    mutate_(.data, ..., .dots = list())

    transmute_(.data, ..., .dots = list())

    arrange_(.data, ..., .dots = list())

    select_(.data, ..., .dots = list())

    rename_(.data, ..., .dots = list())

    select_vars_(vars, args, include = character(), exclude = character())

    rename_vars_(vars, args)

### Arguments

`x` | a `tbl()` to tally/count.
`wt` | (Optional) If omitted, will count the number of rows. If specified, will perform a "weighted" tally by summing the (non-missing) values of variable `wt`. This argument is automatically quoted and later evaluated in the context of the data frame. It supports unquoting. See `vignette("programming")` for an introduction to these concepts.
`sort` | if `TRUE` will sort output in descending order of `n`
`vars` | Various meanings depending on the verb.
`.data` | A data frame.
`.keep_all` | If `TRUE`, keep all variables in `.data`. If a combination of `...` is not distinct, this keeps the first row of values.
`dots, .dots, ...` | Pair/values of expressions coercible to lazy objects.
`args` | Various meanings depending on the verb.
`env` | The environment in which functions should be evaluated.
`add` | When `add = FALSE`, the default, `group_by()` will override existing groups. To add to the existing groups, use `add = TRUE`.
`include` | Character vector of column names to always include/exclude.
`exclude` | Character vector of column names to always include/exclude.

### Details

Unquoting triggers immediate evaluation of its operand and inlines the result within the captured expression. This result can be a value or an expression to be evaluated later with the rest of the argument. See `vignette("programming")` for more information.

[Package dplyr version 0.7.0 Index]