Thanks.
The problem is that there is extremely little on dataframes or matrices in "An Intro to R", which I did read and I frankly don't know where else to go.
Once I know a function like subset() exists, I can then read the help files on it and that's fine, but I would never dream this function up myself...
As for indexing, I DID read "An Introduction to R" and I did NOT catch the part where it says you can use any variable in the dataframe to index it, nor would I have thought of it by myself. From that documentation, I only learned about using row-labels to index things...
But I am definitely thankful for the quick help given to me by people on this list, and so I guess being RTFM'ed is a small price to pay for figuring out how to solve the problem I need to solve.
Toby
Jeff Laake wrote:
Here's an example:
earlydata=data[data$year<1960,]
Lookup help and read manuals on manipulating dataframes.
Tobias Muhlhofer wrote:
Hi!
Sorry for asking a trivial questions, but I can't seem to figure this out.
I have a dataframe called master containing 30-odd variables.
In this dataframe, I have observations across these 30 variables from 1930 to 2003 (I've made a "year" variable). How can I drop all rows for which the year is less than 1960? I'm assuming something with ifelse() but I can't quite figure it out.
I would appreciate a suggestion of some syntax.
Thanks! Toby
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