[R] Assigning into each of a list of dataframes

From: Chuck Cleland <ccleland_at_optonline.net>
Date: Fri, 18 Jan 2008 10:37:09 -0500

   What is the right way to assign a new variable into each a of list of data frames? Here is my failed attempt:

mylist <- list(df1 = data.frame(A = runif(5), B = runif(5)),

                df2 = data.frame(A = runif(5), B= runif(5)))

lapply(mylist, function(x){x$Y <- x$A * x$B})

$df1

[1] 0.25589928 0.03446026 0.94992362 0.21388326 0.08668821

$df2

[1] 0.08771839 0.05643553 0.09036894 0.09179378 0.37394748

mylist
$df1

           A B

1 0.3293760 0.77692140
2 0.1283307 0.26852710
3 0.9865388 0.96288517
4 0.5087024 0.42044870
5 0.9175345 0.09447951


$df2
A B 1 0.3887178 0.2256608 2 0.2642189 0.2135938 3 0.3881635 0.2328115

4 0.9060760 0.1013091
5 0.4578424 0.8167602

   I want the variable Y to be added to each data frame in mylist.

thanks,

Chuck

-- 
Chuck Cleland, Ph.D.
NDRI, Inc.
71 West 23rd Street, 8th floor
New York, NY 10010
tel: (212) 845-4495 (Tu, Th)
tel: (732) 512-0171 (M, W, F)
fax: (917) 438-0894

______________________________________________
R-help_at_r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Received on Fri 18 Jan 2008 - 15:46:46 GMT

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.2.0, at Fri 18 Jan 2008 - 16:30:07 GMT.

Mailing list information is available at https://stat.ethz.ch/mailman/listinfo/r-help. Please read the posting guide before posting to the list.

list of date sections of archive