As a newer R practicioner, it seems I stump myself weekly (at least) with issues that have spinning my wheels.  Here is yet another... I'm trying to turn a list of numeric vectors (of uneual length) inot a dataframe.  Each vector held in the list represents a row, and there are some rows of unequal length.  I would like NAs as placeholders for "missing" data in the shorter vectors.  I think I'm missing something quite basic.
 
v1 <- c(1,2,3,4)
v2 <- c(1,2)
lst1 <- list(v1,v2)
 
Of course there is the intuitive:
 
as.data.frame(lst1)
 
However, the recycling rule (expectedly) reclycles 1,2 versus using NAs as placeholders.
 
Then, looking into Teetor's R Cookbook, there is a piece of code that looked (from the description) like it might do the trick:
 
do.call(rbind, Map(as.data.frame,lst1)
 
But I get the error:
Error in match.names(clabs, names(xi)) : 
  names do not match previous names
 
Thinking the source of the error had to do with the vectors of unequal lenght, I tried Hadley's rbind.fill thusly:
 
library(reshape)
do.call(rbind.fill, Map(as.data.frame,lst1)
 
Which produced a dataset, but gain, not in the desired format.
 
Thanks in advance to anyone that can bring my frustrations to end!
C
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