problems creating data frames

Another approach might be to start with a list, pad
the vectors and then convert to a data.frame.  Here is
something that Henrique Dallazuanna and Phil Spector
suggested to me a couple of days ago as a way of
solving something of a similar problem. 

It seems to have the advantage that it will handle
characters and factors as well.

worrylist = list(Behavior_Therapy = c(6, 7, 6, 5, 5,
5, 7, 8, 9, 6, 6, 7),
                          Atenolol = c(4, 8, 10, 3, 6,
5, 6, 3, 7, 5, 4, 6),
                          Placebo = c(0, 7, 0, 7, 0,
7))

mlen = max(sapply(worrylist,length))
eqlens = lapply(worrylist,function(x)if(length(x) <
mlen)

c(x,rep(NA,mlen-length(x))) else x)

kitbag <- do.call(data.frame, eqlens) ; kitbag 

As for the names I think you're running into some kind
of naming conventions in the assign statement.  As a
work around why not just call the vectors x,y,a and
then do a names(mydata) <- c( "S+P-", and so on)

--- Gabor Grothendieck <ggrothendieck at gmail.com>
wrote:

problems creating data frames

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