Replace empty values with value from other column in a dataframe

Question

In one column of my dataframe I have some empty cells. The data looks like this:

   yymmdd    lat   lon mag depth knmilocatie baglocatie   tijd
 19861226 52.         


        

Answer 1

Or you can use a support vector:

empty <- df$baglocatie == ""
df$baglocatie[empty] <- df$knmilocatie[empty]

Answer 2

Try ifelse:

df$baglocatie <- ifelse(df$baglocatie == "", df$knmilocatie, df$baglocatie)

Answer 3

You need to index also the replacing column:

df[ df$baglocatie == "", "baglocatie"  ]  <- df[ df$baglocatie == "", "knmilocatie" ]