Thank you. That worked.
On 19-Jun-2014 3:24 PM, Uwe Ligges wrote:
On 19.06.2014 23:50, Chris Dolanc wrote:
Hello,
I have a data frame with > 5000 columns and I'd like to be able to make
subsets of that data frame made up of certain columns by using part of
the column names. I've had a surprisingly hard time finding something
that works by searching online.
For example, lets say I have a data frame (df) of 2 obs. of 6 variables.
The 6 variables are called "1940_tmax", "1940_ppt", "1940_tmin",
"1941_tmax", "1941_ppt", "1941_tmin". I want to create a new data frame
with only the variables that have "ppt" in the variable (column) name,
so that it looks like this:
plot name 1940_ppt 1941_ppt
774-CL 231 344
778-RW 228 313
Thanks.
df[ , grepl("_ppt$", names(df))]
Best,
Uwe Ligges
--
Christopher R. Dolanc
Post-doctoral Researcher
University of California, Davis &
University of Montana
______________________________________________
R-help@r-project.org mailing list
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.
