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I have a dataset that has many columns which are NA or constant, and so I remove them like so: same <- sapply(dataset, function(.col){ all(is.na(.col)) || all(.col[1L] == .col) }) dataset <- dataset[!same] This works GREAT (thanks to the r-users list archive I found this) however, then when I do my data sampling like so: testSize <- floor(nrow(x) * 10/100) test <-

...4 vmlinuz /tftpboot/pxelinux.cfg directory listing: [steveo at pxelinux steveo]$ ls -l /tftpboot/pxelinux.cfg total 6 -rw-r--r-- 1 root root 137 Aug 12 13:25 C0A868 drwxr-xr-x 2 root root 1024 Aug 14 11:01 good drwxr-xr-x 2 root root 1024 Sep 4 10:34 good2 drwxr-xr-x 2 root root 1024 Aug 14 16:16 rh drwxr-xr-x 2 root root 1024 Jul 25 17:35 save drwxr-xr-x 2 root root 1024 Aug 12 13:25 save1 Contents of C0A868: (note: APPEND line is wrapped) [steveo at pxelinux steveo]$ cat /tftpboot/pxelinux.cfg/C0A868...