r conditionally replicate row in a data frame [duplicate]

StackOverflow https://stackoverflow.com/questions/21573670

Question

My data frame looks like this:

SIT LOC NB VAL
A a 1 0.256
A b 451 0.023
B a 2 0.123
B b 1 0.741

I would like to replicate NB times the rows. For example, I want the second line to be replicated 451 times. Then, I will not need anymore the column "NB" and this simplify the use of functions such as aggregate, etc.

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Solution

Use subsetting with rep:

DF <- read.table(text="SIT LOC NB VAL
A a 1 0.256
A b 451 0.023
B a 2 0.123
B b 1 0.741", header=TRUE)

DFrep <- DF[rep(seq_len(nrow(DF)), DF$NB),]
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