2018-10-12 19:37:13 +00:00
|
|
|
|
---
|
|
|
|
|
|
title: Objects in R
|
|
|
|
|
|
---
|
|
|
|
|
|
## Objects
|
|
|
|
|
|
|
|
|
|
|
|
R allows to save the data by storing it inside an R object.
|
|
|
|
|
|
|
|
|
|
|
|
## What’s an object?
|
|
|
|
|
|
|
|
|
|
|
|
It is just a name that you can use to call up stored data. For example, you can save data into an object like a or b.
|
|
|
|
|
|
```r
|
|
|
|
|
|
> a <- 5
|
|
|
|
|
|
> a
|
|
|
|
|
|
[1] 5
|
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
|
|
## How to create an Object in R?
|
|
|
|
|
|
|
|
|
|
|
|
1. To create an R object, choose a name and then use the less-than symbol, `<`,
|
|
|
|
|
|
followed by a minus sign, `-`, to save data into it. This combination looks like an
|
|
|
|
|
|
arrow, `<-`. R will make an object, give it your name, and store in it whatever
|
|
|
|
|
|
follows the arrow.
|
|
|
|
|
|
|
|
|
|
|
|
2. When you ask R what’s in a, it tells you on the next line. For example:
|
|
|
|
|
|
|
|
|
|
|
|
```r
|
|
|
|
|
|
> die <- 1:6
|
|
|
|
|
|
> die
|
|
|
|
|
|
[1] 1 2 3 4 5 6
|
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
|
|
3. You can name an object in R almost anything you want, but there are a few rules. First,
|
|
|
|
|
|
a name cannot start with a number.
|
|
|
|
|
|
Second, a name cannot use some special symbols, like `^, !, $, @, +, -, /, or *`:
|
|
|
|
|
|
|
|
|
|
|
|
4. R also understands capitalization (or is case-sensitive), so name and Name will refer to different objects.
|
|
|
|
|
|
|
|
|
|
|
|
5. You can see which object names you have already used with the function `ls()`.
|
|
|
|
|
|
|
|
|
|
|
|
## References
|
|
|
|
|
|
|
2018-10-25 05:39:58 +00:00
|
|
|
|
* [Official Docs](https://cran.r-project.org/manuals.html)
|
|
|
|
|
|
* [Objects in R by r-bloggers](https://www.r-bloggers.com/classes-and-objects-in-r/)
|
|
|
|
|
|
* [CRAN](https://cran.r-project.org/doc/manuals/r-release/R-lang.html)
|
