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

You need to index also the replacing column:

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