Hi,
  
 Apologies for the newbie error.  Thanks John, Jim, Jeff!
  
 Please find the dput output below.  I'm trying to take list1 and list 2 and 
bind them together at an individual list level by column - all the structures 
and col names will be the same, but the number of rows could be different for 
any sublist.  The output should end up looking like list3.  
  
 Please let me know if this remains unclear.  Any help/guidance would be 
greatly appreciated!!
  
 Many Thanks,
 Vince
  
  
 list1<-list(structure(list(id = c(493L, 564L, 147L, 83L, 33L, 276L, 402L, 
285L, 30L, 555L), 
                     WgtBand = c(1, 1, 2, 3, 4, 5, 6, 7, 8, 9), 
                     Wgt = c(NaN, NaN, NA, NA, NA, NA, NA, NA, NA, NA)), 
                .Names = c("id", "WgtBand", "Wgt")), 
      structure(list(id = c(76L, 330L, 574L, 47L, 131L, 581L, 133L, 69L, 35L, 
487L), 
                     WgtBand = c(1, 1, 2, 3, 4,5, 6, 7, 8, 9), 
                     Wgt = c(NaN, NaN, NA, NA, NA, NA, NA, NA, NA, NA)), 
                .Names = c("id", "WgtBand", "Wgt")), 
      structure(list(id = c(376L, 130L, 574L, 47L, 131L, 581L, 133L, 69L, 35L, 
487L), 
                     WgtBand = c(1, 1, 2, 3, 4,5, 6, 7, 8, 9), 
                     Wgt = c(NaN, NaN, NA, NA, NA, NA, NA, NA, NA, NA)), 
                .Names = c("id", "WgtBand", "Wgt")))


 list2<-list(structure(list(id = c(493L, 564L, 147L), 
                            WgtBand = c(1, 2, 3), 
                            Wgt = c(NaN, NaN, NA)), 
                       .Names = c("id", "WgtBand", "Wgt")), 
             structure(list(id = c(276L, 411L, 574L,111L), 
                            WgtBand = c(1, 2, 3,4), 
                            Wgt = c(NaN, NaN, NA,NA)), 
                       .Names = c("id", "WgtBand", "Wgt")), 
             structure(list(id = c(76L, 330L), 
                            WgtBand = c(1, 1), 
                            Wgt = c(NaN, NaN)), 
                       .Names = c("id", "WgtBand", "Wgt")))

 list3<-list(structure(list(id = c(493L, 564L, 147L, 83L, 33L, 276L, 402L, 
285L, 30L, 555L,493L, 564L, 147L), 
                            WgtBand = c(1, 1, 2, 3, 4, 5, 6, 7, 8, 9,1, 2, 3), 
                            Wgt = c(NaN, NaN, NA, NA, NA, NA, NA, NA, NA, 
NA,NaN, NaN, NA)), 
                       .Names = c("id", "WgtBand", "Wgt")), 
             structure(list(id = c(376L, 130L, 574L, 47L, 131L, 581L, 133L, 
69L, 35L, 487L,276L, 411L, 574L,111L), 
                            WgtBand = c(1, 1, 2, 3, 4,5, 6, 7, 8, 9, 1, 2, 
3,4), 
                            Wgt = c(NaN, NaN, NA, NA, NA, NA, NA, NA, NA, 
NA,NaN, NaN, NA,NA)), 
                       .Names = c("id", "WgtBand", "Wgt")), 
             structure(list(id = c(76L, 330L, 574L, 47L, 131L, 581L, 133L, 69L, 
35L, 487L,76L, 330L), 
                            WgtBand = c(1, 1, 2, 3, 4,5, 6, 7, 8, 9, 1, 1), 
                            Wgt = c(NaN, NaN, NA, NA, NA, NA, NA, NA, NA, 
NA,NaN, NaN)), 
                       .Names = c("id", "WgtBand", "Wgt")))
 
> Date: Mon, 11 May 2015 18:19:06 -0800
> From: jrkrid...@inbox.com
> Subject: RE: [R] binding two lists of lists of dataframes together
> To: newrnew...@hotmail.com; r-help@r-project.org
> 
>  http://adv-r.had.co.nz/Reproducibility.html
> 
> and please do not post in Html.
> 
> 
> John Kane
> Kingston ON Canada
> 
> 
> > -----Original Message-----
> > From: newrnew...@hotmail.com
> > Sent: Mon, 11 May 2015 20:16:40 +0000
> > To: r-help@r-project.org
> > Subject: [R] binding two lists of lists of dataframes together
> > 
> >  Hi,
> > I'm new to R and am stumped.  I'm trying to bind List 1 to List 2 and
> > have the corresponding Output.
> > 
> > I've found the following code - I can't say I understand
> > rbindlist(lapply(list12, "[", i, TRUE)).  Either way - it doesn't give
> > exactly what's needed.
> > 
> > library(data.table)
> > list12 <- list(List1,List2)
> > nr <- as.vector(nrow(list12[[1]]))
> > fastbind.ith.rows <- function(i) rbindlist(lapply(list12, "[", i, TRUE))
> > fastbound <- lapply(1:nr, fastbind.ith.rows)
> > 
> > It produces Output 2 - where dataframes are grouped together by rownames,
> > but keeps 2 separate vectors - vs. binding the two into 1 vector.
> > 
> > Any help/guidance would be greatly appreciated!!
> > 
> > Thanks!
> > Vince
                                          
        [[alternative HTML version deleted]]

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