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rrandomsample

Choose randomly a number from two columns rstudio

I have this data frame and I' trying to create a new column considering the data in the first column and the column called "zero", I've been using sample(), for an interval from (0,df$first) but It gaves me a number between 0 and the data in the first column, not one(0) or another (as an example 9).

Initial data frame: 

> df
  first zero 
1     9    0   
2     8    0   
3    16    0

What I want is something like this:

> df
  first zero new
1     9    0   9
2     8    0   0
3    16    0  16

I really appreciate your answers or opinions. Thank you!

Solution

  • I am not sure if you want this

    set.seed(1)
df$new <- df[cbind(seq(nrow(df)),
                   sample(2,nrow(df),replace = TRUE))]

    such that

    > df
  first zero new
1     9    0   9
2     8    0   0
3    16    0  16

    DATA

    df <- structure(list(first = c(9, 8, 16), zero = c(0, 0, 0)), class = "data.frame", row.names = c(NA, 
-3L))