[R] Stacking Vectors/Dataframes

[Samuelson, Frank*]

or something like
new.frame<-rbind(x.frame,y.frame);  # A frame of the right size.
new.frame[seq(1,nrow(x.frame),by=2),] <- x.frame  # Assign every other row
new.frame[seq(2,nrow(x.frame),by=2),] <- y.frame  # Assign every other row.

-----Original Message-----
From: Laura Quinn [mailto:laura at env.leeds.ac.uk] 
Sent: Sunday, August 15, 2004 7:11 PM
To: r-help at stat.math.ethz.ch
Subject: [R] Stacking Vectors/Dataframes


Hello,

Is there a simple way of stacking/merging two dataframes in R? I want to
stack them piece-wise, not simply add one whole dataframe to the bottom of
the other. I want to create as follows:

x.frame:
aX1  bX1  cX1  ... zX1
aX2  bX2  cX2  ... zX2
...  ...  ...  ... ...
aX99 bX99 cX99 ... zX99

y.frame:
aY1  bY1  cY1  ... zY1
aY2  bY2  cY2  ... zY2
...  ...  ...  ... ...
aY99 bY99 cY99 ... zY99

new.frame:
aX1  bX1  cX1  ... zX1
aY1  bY1  cY1  ... zY1
aX2  bX2  cX2  ... zX2
aY2  bY2  cY2  ... tY2
...  ...  ...  ... ...
aX99 bX99 cX99 ... tX99
aY99 bY99 cY99 ... tY99

I have tried to use a for loop (simply assigning and also with rbind) to
do this but am having difficulty correctly assigning the destination in the
new dataframe. Can
anyone offer a quick and easy way of doing this (or even a long winded one
if it works!!)

Thank you in advance,

Laura Quinn
Institute of Atmospheric Science
School of the Environment
University of Leeds
Leeds
LS2 9JT

tel: +44 113 343 1596
fax: +44 113 343 6716
mail: laura at env.leeds.ac.uk

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