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Modify list section (#35334)

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Change the name of list and the objects inside the list. Add different ways to extract the contents of a list in R.
This commit is contained in:
Sudhakar Kumar
2019-06-28 12:46:14 +05:30
committed by Randell Dawson
parent 53b44459e7
commit b18560f8d6
1 changed files with 10 additions and 6 deletions
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16
guide/english/r/subsetting-data/index.md
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@ -59,15 +59,18 @@ df[c(1, 3), ]
## 3 3 1 c
```
To get content of a list use `[[` operator like:
To get contents of a list use `[[` or `$` operator like:
```r
a <- list(a = 1, b = 2)
a[[1]]
## [1] 1
sample_list <- list(char = "List-in-R", num = c(1:9), bool = TRUE)
sample_list[[1]]
## [1] "List-in-R"
a[["a"]]
## [1] 1
sample_list[["num"]]
## [1] 1 2 3 4 5 6 7 8 9
sample_list$bool
## [1] TRUE
```
## Resources
@ -76,3 +79,4 @@ a[["a"]]
* [R Documentation](https://www.rdocumentation.org/packages/base/versions/3.5.1/topics/subset)
* [R Bloggers](https://www.r-bloggers.com/5-ways-to-subset-a-data-frame-in-r/)
* [Advanced R](http://adv-r.had.co.nz/Subsetting.html)
* [Spoken Tutorials](https://spoken-tutorial.org/watch/R/Indexing%2Band%2BSlicing%2BData%2BFrames/English/)