Gavin,
One more note, which is that even timing the direct data frame creation
on my system with colnames, again using the same 10 numeric columns, I
get:
> system.time(DF1 <- data.frame(lc.ratio = Col1, Q = Col2, fNupt = Col3,
rho.n = Col4, rho.s = Col5,
net.Nimm = Col6, net.Nden = Col7,
CLminN = Col8, CLmaxN = Col9,
CLmaxS = Col10))
[1] 0.012 0.000 0.028 0.000 0.000
> str(DF1)
'data.frame': 4471 obs. of 10 variables:
$ lc.ratio: num 0.1423 0.1873 -1.8129 0.0255 -1.7650 ...
$ Q : num 0.8340 -0.2387 -0.0864 -1.1184 -0.3368 ...
$ fNupt : num -0.1718 -0.0549 1.5194 -1.6127 -1.2019 ...
$ rho.n : num -0.740 0.240 0.522 -1.492 1.003 ...
$ rho.s : num -0.2363 -1.6248 -0.3045 0.0294 0.1240 ...
$ net.Nimm: num -0.774 0.947 -1.098 0.809 1.216 ...
$ net.Nden: num -0.198 -0.135 -0.300 -0.618 -0.784 ...
$ CLminN : num 0.924 -3.265 0.211 0.813 0.262 ...
$ CLmaxN : num 0.3212 -0.0502 -0.9978 0.9005 -1.6535 ...
$ CLmaxS : num -0.520 0.278 -0.546 -0.925 1.507 ...
So there is something else going on, either with your code or some other
conflict, unless my assumptions about your data are incorrect.
HTH,
Marc
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