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.
Being RTFM'ed is even more valuable when the answer given is wrong (as mine was) but the manual page is right. I showed you how to select the rows where year < 1960 rather than how to drop those rows. :-)
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