Case study

String Manipulation with stringr in R

Charlotte Wickham

Assistant Professor at Oregon State University

chap_5_1.002.png

chap_5_1.003.png

chap_5_1.004.png

readLines()

old_mac <- readLines("old_mac.txt")

str(old_mac)

chr [1:7] "Old MacDonald had a farm" ...

old_mac[1:2]

"Old MacDonald had a farm" "E-I-E-I-O"

str_detect(old_mac, "moo")

FALSE FALSE FALSE FALSE  TRUE FALSE FALSE

which(str_detect(old_mac, "moo"))

old_mac.txt

Old MacDonald had a farm
E-I-E-I-O
And on his farm he had a cow
E-I-E-I-O
Here a moo, There a moo, 
Everywhere a moo-moo
Old MacDonald had a farm
E-I-E-I-O

Alternatively:
```
stringi::stri_read_lines()
```

Let's practice!

String Manipulation with stringr in R