[R] Randomly splitting a data frame in half

Christopher David Desjardins cddesjardins at gmail.com
Thu Mar 19 19:08:48 CET 2009

I have a data frame in long format and I would like to randomly divide 
this data frame in half. The data frame consists of 39622 rows and I 
initially tried ...

randomsample1 <- data[sample(nrow(data),19811), ]

Where allows me to randomly select half of the rows and assign them to 
randomsample1 but then I couldn't figure out how to select those rows 
that were not selected and assign them to randomsample2.

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