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selva86/4_5.R

Created January 14, 2020 02:22
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Practice exercise for master R course
Raw
4_5.R
# 1. Direct assignment
system.time ({
item_id_hypo <- numeric()
for(i in 1:10000000){
item_id_hypo[i] <- i
}
item_id_hypo
})
# 2. Preallocate memory
system.time ({
item_id_hypo <- numeric(10000000)
for(i in 1:10000000){
item_id_hypo[i] <- i
}
item_id_hypo
})
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