using substr function

Hye there,
I am very new using Rstudio and i struggle using substr function. I need to Create the new variable country in taking the first two letters of the variable CITIES (Codes) using the substr function. I have a database (which is called dataset2) with this kind of variable : my first column is for CITIES (Codes) like BE001C, my second one for CITIES (Labels) like Brussels, my third one is waste 2012 (amount of waste)…
I need to create a new variable but i am struggling doing it. Could someone help me getting a better understanding of the situation.
Thanks in advance,

substr is simple

o <- "BE001C"
e <- substr(o,1,2)
#> [1] "BE"

Created on 2022-11-25 by the reprex package (v2.0.1)

Here o is an object containing a six-letter string. e is another object created by applying substr to o from position 1 to position 2.

No embedded blanks, close-up as waste2012 or waste_2012.

Creating the variable is distinct from naming it. If you have a data frame with 5 rows and 3 columns called dat and you want to add a column of five rows

dat$new <- c(1,2,3,4,5)

for example. Then you can rename using colnames.


dataset2 <- tibble(cit_codes = c("BE001C", "SR567F"),
                   cit_labels = c("Brussels", "Example"),
                   waste = c(30, 40))

# A tibble: 2 × 3
  cit_codes cit_labels waste
  <chr>     <chr>      <dbl>
1 BE001C    Brussels      30
2 SR567F    Example       40

dataset2 <- dataset2 %>% 
  mutate(contry = substr(cit_codes, start = 1, stop = 2))


# A tibble: 2 × 4
  cit_codes cit_labels waste contry
  <chr>     <chr>      <dbl> <chr> 
1 BE001C    Brussels      30 BE    
2 SR567F    Example       40 SR  

Dear flm, dear technocrat, thanks for your answers but R says that the function mutate is unknown. Why does it do that ?

try to add at the beginning of the script this line library(tidyverse)

A big thanks to you, it works !!!!

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