How could I split a data.frame?

Question

I have 50 synoptic stations precipitation data from 1986 to 2015.

I need to sort the related information for the period of years from 2007 to 2015 for each station separately. I mean there are three variables:

1. the station's name
2. the specific year
3. the amount of precipitation

I need the result for each station separately. Does anyone know how to use "split" for this purpose? May you please write codes from the beginning "read.table"?

Answer 1

If your task is simply to split the dataframe by year you can use split :

split(df, f = df$year)

Illustrative data:

(set.seed(123)
df <- data.frame(
  station = sample(LETTERS[1:3],10, replace = T),
  year = paste0("201", sample(1:9, 10, replace = T)),
  precipitation = sample(333:444, 10, replace = T)
)

Result:

$`2011`
  station year precipitation
5       C 2011           406
8       C 2011           399

$`2013`
  station year precipitation
7       B 2013           393
9       B 2013           365

$`2015`
  station year precipitation
2       C 2015           410

$`2016`
  station year precipitation
4       C 2016           444

$`2017`
  station year precipitation
3       B 2017           404

$`2019`
   station year precipitation
1        A 2019           432
6        A 2019           412
10       B 2019           349