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plyr (version 1.5.1)

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

462,444

Version

1.5.1

License

MIT

Maintainer

Hadley Wickham

Last Published

April 13th, 2011

Functions in plyr (1.5.1)

Fail with specified value.

Check if a data frame is empty.

Split array, apply function, and discard results.

Convert input to quoted variables.

Descending order.

Convert split list to regular list.

Split iterator that returns values, not indices.

An indexed data frame.

Split list, apply function, and discard results.

Join two data frames together.

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

Count the number of occurences.

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

Round to multiple of any number.

Quote variables to create a list of unevaluated expressions for later...

Print quoted variables.

Replicate expression and return results in a list.

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

Graphical progress bar, powered by Tk.

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

Quick data frame.

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

Evaluate a quoted list of variables.

Dimension names.

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

create_progress_bar

Create progress bar.

Number of unique values.

Summarise a data frame.

Generate labels for split data frame.

Order a data frame by its colums.

Mutate a data frame by adding new or replacing existing columns.

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

Number of dimensions.

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

Try, with default in case of error.

Aggregate multiple functions into a single function.

Null progress bar...

Compute names of quoted variables.

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

Combine data...

Vector aggregate.

Replicate expression and return results in a array.

Replicate expression and discard results.

Experimental iterator based version of llply.

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

Numeric id for a vector.

Construct an immutable data frame.

Text progress bar.

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

Column-wise function.

Modify names by name, not position.

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

List to vector.

Remove splitting variables from a data frame.

list_to_dataframe

List to data frame.

Graphical progress bar, powered by Windows.

Reduce dimensions.

Function that always returns true.

Extract matching rows of a data frame.

Replicate expression and return results in a data frame.

Split a data frame by variables.

An indexed array.

Determine if a vector is discrete.

Split an array by...

`Splat' arguments to a function.

Apply with built in try.

as.data.frame.function

Make a function return a data frame.

rbind.fill.matrix

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

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

Split data frame, apply function, and discard results.

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

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Monthly ozone measurements over Central America

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Yearly batting records for all major league baseball players