Adding new column with conditional values using ifelse

Question

I have a data frame with more than 400.000 observations and I\'m trying to add a column to it which its values depend on another column and sometimes multiple ones.

Answer 1

Same idea but assign it like this instead. No package needed.

M$Size <- ifelse(M$Number <= 50, 'Small', ifelse(M$Number <= 70, 'Medium', 'Big'))

Result:

  Letter Number   Size
1      A      5  Small
2      B    100    Big
3      C     60 Medium