[R] rbind-ing list
pburns at pburns.seanet.com
Tue Jan 30 11:41:12 CET 2007
The original poster is correct that the loop can be
astoundingly inefficient. The issue is not so much
overwriting a variable, but increasing its size as it
In cases where 'do.call' won't do, then a good approach
is to create the object with its final size and then
subscript into it to replace parts of it on each iteration.
patrick at burns-stat.com
+44 (0)20 8525 0696
(home of S Poetry and "A Guide for the Unwilling S User")
jim holtman wrote:
>On 1/29/07, jiho.han <jiho.han at yahoo.com> wrote:
>>i have a list of data.frame that has same structure. i would like to know a
>>efficient way of rbind-ing it.
>>right now, i write:
>>n = length(temp) # 'temp' is a list of data.frames
>>temp2 = data.frame()
>>for (i in 1:n) temp2 = rbind( temp2, temp[[i]])
>>but this is not an efficient way since we keeping overwriting temp2. i
>>wonder if there's faster way.
>>View this message in context: http://www.nabble.com/rbind-ing-list-tf3140137.html#a8703373
>>Sent from the R help mailing list archive at Nabble.com.
>>R-help at stat.math.ethz.ch mailing list
>>PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>>and provide commented, minimal, self-contained, reproducible code.
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