creating a variable based on other factors using R

My data looks like this:

Individuals with the same hh_id lives in the same household so they will have the same household income. And for that the variable hh_income equal the sum of the salary of all persons with the same hh_id;

so my data would look like:

Any ideas please;

>Solution :

You can use R base function ave to generate sum of ind_salary grouped by hh_id and get a vector of the same length of ind_salary

> df$hh_income <- ave(df$ind_salary, df$hh_id, FUN=sum)
> df
  hh_id indl ind_salary hh_income
1     1    1        200       650
2     1    2        450       650
3     1    3          0       650
4     2    4       1232      1655
5     2    5        423      1655