Fix broken example post move-around

2016-01-22 10:03:10 -06:00
parent 986ea61453
commit 5e8d952313
1 changed files with 1 additions and 0 deletions
--- a/lists.Rmd
+++ b/lists.Rmd
@@ -192,6 +192,7 @@ results
 If you do this a lot, you should probably make a function for it:

 ```{r}
+df <- data.frame(x = 1:10, y = rnorm(100))
 col_medians <- function(df) {
  out <- vector("numeric", ncol(df))
  for (i in 1:ncol(df)) {