transmute-table.express: Compute new columns

In table.express: Build 'data.table' Expressions with Data Manipulation Verbs

Compute new columns

Description

Compute and keep only new columns.

Usage

## S3 method for class 'ExprBuilder'
transmute(
  .data,
  ...,
  .enlist = TRUE,
  .sequential = FALSE,
  .parse = getOption("table.express.parse", FALSE),
  .chain = getOption("table.express.chain", TRUE)
)

## S3 method for class 'EagerExprBuilder'
transmute(.data, ..., .parent_env = rlang::caller_env())

## S3 method for class 'data.table'
transmute(.data, ...)

Arguments

.data	An instance of ExprBuilder.
...	Clauses for transmuting columns. For j inside the data.table's frame.
.enlist	See details.
.sequential	If TRUE, each expression in ... is assigned to a nested body within curly braces to allow them to use variables created by previous expressions. The default is FALSE because enabling this may turn off some data.table optimizations.
.parse	Logical. Whether to apply rlang::parse_expr() to obtain the expressions.
.chain	Logical. Should a new frame be automatically chained to the expression if the clause being set already exists?
.parent_env	See end_expr()

Details

Everything in ... is wrapped in a call to list by default. If only one expression is given, you can set .enlist to FALSE to skip the call to list.

To see more examples, check the vignette, or the table.express-package entry.

Examples

data("mtcars")

data.table::as.data.table(mtcars) %>%
    transmute(ans = mpg * 2)

table.express documentation built on April 3, 2023, 5:43 p.m.