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
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