How do add a column in a data frame in R

Question

I have imported data from a file into a data frame in R. It is something like this.

Name      Count   Category
A         100     Cat1
C         10      Cat2
         


        

Answer 1

You can use ifelse. If your data frame were called df you would do:

df$cat <- ifelse(df$name<100, "Ones", "Hundreds")
df$cat <- ifelse(df$name<1000, df$cat, "Thousands")