vectorized expression to rbind a list of dataframes? [duplicate]

Question

Apologies in advance if this is a duplicate question, but I can't find anything on this in the stack overflow archives.

I wrote a function that returns a zoo object (makeTrace1). In a second function (make2DHist), I call this function many times and so generate a list of dataframes (converted from the returned zoo objects). I would then like to rbind all these dataframes in my list together. I can rbind specific elements together so I could do this with a for loop, but is there a vectorized expression to rbind all the dataframes in the list together?

Here's my code:

make2DHist <- function() { v = list() times=4 for(i in 1:times) { vv = makeTrace1() v[[i]] = data.frame(Date=time(vv), vv, check.names = FALSE, row.names=NULL) } hhh = rbind(v[[1]], v[[2]]) <-----this works hhh2 = rbind(v[c(1:4)]) <-this does not work } m= make2DHist()

I would go with do.call("rbind", lst) or using the data.table package rbindlist(lst) — user20650
– user20650, Commented Nov 24, 2014 at 23:34
@Henrik Thank you, but this is probably not a duplicate. That question was a question of how to flatten a list. This question was about how to vectorize an rbind. I read that question before posting this one. — Sunnyside Productions
– Sunnyside Productions, Commented Nov 25, 2014 at 15:02

mmuurr · Accepted Answer · 2014-11-24 23:35:37Z

1

> x <- do.call(rbind, your_list_of_matrices_or_data_frames_here)

answered Nov 24, 2014 at 23:35

mmuurr

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2 Comments

mmuurr Over a year ago

Also look at rbind.fill in the (very useful) plyr package.

Sunnyside Productions Over a year ago

Thank you! I'm new to R so these suggestions are really helpful.

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