r - Create new column based on 4 values in another column

Question

I want to create a new column based on 4 values in another column.

if col1=1 then col2= G;
if col1=2 then col2=H;
if col1=3 then col2=J;
if col1=4 then col2=K.

HOW DO I DO THIS IN R? Please I need someone to help address this. I have tried if/else and ifelse but none seems to be working. Thanks

Answer 1

You could use nested ifelse:

col2 <- ifelse(col1==1, "G",
        ifelse(col1==2, "H",
        ifelse(col1==3, "J",
        ifelse(col1==4, "K",
                        NA  )))) # all other values map to NA

In this simple case it's overkill, but for more complicated ones...