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Q: 

Help with rdply()

I love the progress bar with rdply() and I want to convert some of my loops (thanks to Hadley!). Is there a way to use a counter in rdply()? I need to accumulate values over replications. The code I want to convert is below. Thanks!

reps <- 4
store <- numeric(4)
c <- 0
for(i in 1:reps){c <- c + 1; store[i] <- c}
store

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