October 2015
Beginner to intermediate
246 pages
4h 55m
English
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plyr
The logic of plyr is very similar to aggregate() and apply(). In fact, the title of the package is Tools for splitting, applying, and combining data.
Its main functions can be easily understood since they are all named for its input and output objects, based upon the following references:
d: This is for a data framea: This is for an arrayl: This is for a listm: This is for a data frame or an array (column-wise, only as input)_: This is for a function's guess (only for outputs)
So, for instance, laply receives a list and returns an array, ddply receives a data frame and returns a data frame, and so on.
Although the package has a wide variety of functions available, all the ones that have a data frame as input are the most important ones (also, ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.