Hi R users,
I have a problem about using R studio. For example, there is a dataframe
that has many columns. I want to aggregated column X and column Y into
column Z. Column Z does not exist before the aggregation. I use the code
below:
df$Z = df$X + df$Y
However, it does not work in the top left panel in Rstudio, and has the
following warning message:
Error in `$<-.data.frame`(`*tmp*`, "Z", value = numeric(0)) :
replacement has 0 rows, data has 34333
If I type the same code in the Console panel (bottom left panel), it works.
How to deal with this problem? Thanks.
[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
