rowwise: Group input by rows

In stemangiola/tidySingleCellExperiment: Brings SingleCellExperiment to the Tidyverse

Group input by rows

Description

rowwise() allows you to compute on a data frame a row-at-a-time. This is most useful when a vectorised function doesn't exist.

Most dplyr verbs preserve row-wise grouping. The exception is summarise(), which return a grouped_df. You can explicitly ungroup with ungroup() or as_tibble(), or convert to a grouped_df with group_by().

Usage

## S3 method for class 'SingleCellExperiment'
rowwise(data, ...)

Arguments

data	Input data frame.
...	<tidy-select> Variables to be preserved when calling summarise(). This is typically a set of variables whose combination uniquely identify each row. NB: unlike group_by() you can not create new variables here but instead you can select multiple variables with (e.g.) everything().

Value

A row-wise data frame with class rowwise_df. Note that a rowwise_df is implicitly grouped by row, but is not a grouped_df.

List-columns

Because a rowwise has exactly one row per group it offers a small convenience for working with list-columns. Normally, summarise() and mutate() extract a groups worth of data with [. But when you index a list in this way, you get back another list. When you're working with a rowwise tibble, then dplyr will use [[ instead of [ to make your life a little easier.

See Also

nest_by() for a convenient way of creating rowwise data frames with nested data.

Examples

# TODO

stemangiola/tidySingleCellExperiment documentation built on Dec. 22, 2024, 7:56 a.m.