June 2019
Beginner to intermediate
360 pages
10h 55m
English
Content preview from Big Data Simplified
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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.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.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.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.
198 | Big Data Simplied
The subset of a data frame can be drawn in two ways and it is briey explained as follows.
Option 1: By specifying column numbers or names in parenthesis.
> dfStud[ ,1:3]
StudIdStudNameStudMarks
1 6 Sejal 76
2 7 Param 56
3 8 Hetal 93
4 9 Minu 78
5 10 Virat 82
> dfStud[ ,c(“StudId”, “StudHeight”)]
StudIdStudHeight
1 6 Tall
2 7 Short
3 8 Short
4 9 Medium
5 10 Tall
Option 2: By using subset() function.
> subset(dfStud[c(“StudId”, “StudHeight”)])
StudIdStudHeight
1 6 Tall
2 7 Short
3 8 Short
4 9 Medium
5 10 Tall
> subset(dfStud, StudMarks> 80)
StudIdStudNameStudMarksStudHeight
3 8 Hetal 93 Short
5 10 Virat 82 Tall
> subset(dfStud[c(“StudId”, “StudName”)], StudMarks> 80)
StudIdStudName ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.