| srckeep {disk.frame} | R Documentation |
Keep only the variables from the input listed in selections
srckeep(diskf, selections, ...)
diskf |
a disk.frame |
selections |
The list of variables to keep from the input source |
... |
not yet used |
cars.df = as.disk.frame(cars) # when loading cars's chunks into RAM, load only the column speed collect(srckeep(cars.df, "speed")) # clean up cars.df delete(cars.df)