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...nt columns 1 through 6 and column 11 (which I won't need, since I know they are going to have the same value), I don't get the error: > hills2000 <- races2000[races2000$type == 'hill', -c(1:6,11)] > hills2000 dist climb time timef Tiso Carnethy 6.00 2500 0.7822222 0.9191667 [...] Cornalees 5.50 800 0.6183333 NA [...] What is causing the error with my original subsetting? I speculated it was related to the NA values, but there is an NA in the resulting hills2000, corresponding to the Cornalees hill race...

...y coplot(time ~ distance | climb, data=hills, overlap=0.0, number=3) the graphs do not appear to line up with the conditional axis climb. Is this a bug or am I missing something as an R newbie? Thanks, Bob Abugov distance climb time Greenmantle 2.5 650 16.083 Carnethy 6.0 2500 48.350 Craig Dunain 6.0 900 33.650 Ben Rha 7.5 800 45.600 Ben Lomond 8.0 3070 62.267 Goatfell 8.0 2866 73.217 Bens of Jura 16.0 7500 204.617 Cairnpapple 6.0 800 36.367 Scolty 5.0...

...d column 11 (which I won't need, since I know they are > going to have the same value), I don't get the error: > > > hills2000 <- races2000[races2000$type == 'hill', -c(1:6,11)] > > hills2000 > dist climb time timef > Tiso Carnethy 6.00 2500 0.7822222 0.9191667 > [...] > Cornalees 5.50 800 0.6183333 NA > [...] > > What is causing the error with my original subsetting? I speculated it > was related to the NA values, but there is an NA in the resulting > hills2000, corres...

--Apple-Mail-44--797532055 Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes Content-Transfer-Encoding: 7bit I believe read.table may report misleading errors. In this example, where a header line in a file has an incorrect number of row names (28 instead of 29), I get the error message "duplicate row.names are not allowed". However, I cannot not find any