October 2015
Beginner to intermediate
246 pages
4h 55m
English
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reshape2
reshape2 is a package that consists mainly of two functions: melt and dcast/acast. Generally, it could be said that melt() transforms one row to multiple and shorter rows while dcast() and acast() do exactly the opposite.
The melt() function, basically, transforms one row of data to many by pivoting a set of variables (the measure variables) over a set of other variables (the id variables). The function is called as follows:
melt(dataset,id.vars,measure.vars,variable_name)
The id variables are usually factors or characters while the measure variables are the numeric ones. In fact, this is the behavior by default if none of the arguments are specified. variable_name is the name that adopts the column where the variables are specified (
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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.