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smalik/howMuchRam.R

Created January 14, 2016 15:28
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howMuchRam.R
# Ripped off from http://stackoverflow.com/questions/21754319/rule-of-thumb-for-memory-size-of-datasets-in-r
# original author Carlos Cinelli
howMuchRAM <-function(ncol, nrow, cushion=3){
#40 bytes per col
colBytes <- ncol*40
#8 bytes per cell
cellBytes <- ncol*nrow*8
#object.size
object.size <- colBytes + cellBytes
#RAM
RAM <- object.size*cushion
cat("Your dataset will have up to", format(object.size*9.53674e-7, digits=1), "MB and you will probably need", format(RAM*9.31323e-10,digits=1), "GB of RAM to deal with it.")
result <- list(object.size = object.size, RAM = RAM, ncol=ncol, nrow=nrow, cushion=cushion)
}
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