Convert negative values to zero in dataframe in R

Question

I have a dataframe in R that I would like to convert all columns (outside the ids) from negative to zero

id1  id2  var1  var2  var3
-1   -1   0     -33     5         


        

Answer 1

You can try using replace:

> mydf[-c(1, 2)] <- replace(mydf[-c(1, 2)], mydf[-c(1, 2)] < 0, 0)
> mydf
  id1 id2 var1 var2 var3
1  -1  -1    0    0    5
2  -1  -2    9    0    0