[R] row combining 2972 files

Yuan Chun Ding ycd|ng @end|ng |rom coh@org
Wed Mar 18 22:32:39 CET 2020

Hi Bert,

Yes,  your code works very well.

Thank you very much!!

From: Bert Gunter [bgunter.4567 using gmail.com]
Sent: Wednesday, March 18, 2020 1:02 PM
To: Yuan Chun Ding
Cc: r-help mailing list
Subject: Re: [R] row combining 2972 files

Untested in the absence of example data, but I think

combined <- do.call(rbind, lapply(ls2972, function(x)get(x)[[2]]))

should do it.

Bert Gunter

"The trouble with having an open mind is that people keep coming along and sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )

On Wed, Mar 18, 2020 at 12:16 PM Yuan Chun Ding <ycding using coh.org<mailto:ycding using coh.org>> wrote:
Hi R users,

I generated 2972 list files in R, each list includes four data frame files , file names for those list file are VNTR13576, VNTR14689, etc.  the second data frame in each list has the same 11 column names, but different number of rows.

I can combine two dataframes by
list2972 <-ls(pat="VNTR.*.")
test <-rbind(get(list2972[16])[[2]],get(list2972[166])[[2]] )

I tried to combine all 2972 data frames from those 2972 list files using do.call or lapply function, but not successful.

Can you help me?

Thank you very much!



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