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plyr (version 1.2.1)

Tools for splitting, applying and combining data

Description

plyr is a set of tools that solves a common set of problems: you need to break a big problem down into manageable pieces, operate on each pieces and then put all the pieces back together. For example, you might want to fit a model to each spatial location or time point in your study, summarise data by panels or collapse high-dimensional arrays to simpler summary statistics. The development of plyr has been generously supported by BD (Becton Dickinson).

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Version

Install

install.packages('plyr')

Monthly Downloads

333,284

Version

1.2.1

License

MIT

Maintainer

Hadley Wickham

Last Published

September 11th, 2010

Functions in plyr (1.2.1)

Extract single column from immutable data frame.

Construct an immutable data frame.

Compute names of quoted variables.

Split array, apply function, and discard results.

as.data.frame.idf

Convert immutable df to regular data frame.

An indexed array.

Descending order.

Graphical progress bar, powered by Tk.

Call function with arguments in array or data frame, returning a list.

Split list, apply function, and return results in an array.

rbind.fill.matrix

Bind matrices by row, and fill missing columns with NA.

Dimension names.

Print quoted variables.

Split list, apply function, and return results in a list.

A unique numeric id for each unique row in a data frame.

Split iterator that returns values, not indices.

Split list, apply function, and discard results.

list_to_dataframe

List to data frame.

Split data frame, apply function, and return results in an array.

Fail with specified value.

Column-wise function.

Split array, apply function, and return results in a list.

Split array, apply function, and return results in an array.

Count the number of occurences.

List to vector.

Immutable df names.

Try, with default in case of error.

Aggregate multiple functions into a single function.

Experimental iterator based version of llply.

Convert input to quoted variables.

Call function with arguments in array or data frame, returning an array.

Split data frame, apply function, and return results in a list.

Replicate expression and return results in a data frame.

Function that always returns true.

Replicate expression and return results in a array.

Split list, apply function, and return results in a data frame.

Replicate expression and return results in a list.

Immutable df subsetting...

Vector aggregate.

Number of unique values.

An indexed data frame.

Split data frame, apply function, and return results in a data frame.

Determine if a vector is discrete.

Summarise a data frame.

Immutable df dimensions.

Reduce dimensions.

Number of dimensions.

Order a data frame by its colums.

Round to multiple of any number...

Call function with arguments in array or data frame, discarding results.

create_progress_bar

Create progress bar.

Quick data frame.

Text progress bar.

Join two data frames together.

Split an array by...

Apply with built in try.

Evaluate a quoted list of variables.

Graphical progress bar, powered by Windows.

Replicate expression and discard results.

Split array, apply function, and return results in a data frame.

`Splat' arguments to a function.

Split data frame, apply function, and discard results.

Null progress bar...

Split a data frame by variables.

Numeric id for a vector.

Quote variables.

Combine data...

Generate labels for split data frame.

Convert split list to regular list.

as.data.frame.function

Make a function return a data frame.

Check if a data frame is empty.

Call function with arguments in array or data frame, returning a data frame.

Ozone measurements

Monthly ozone measurements over Central America

Baseball batting

Yearly batting records for all major league baseball players