[R] Combine multiple tables into one

[arun]

Hi,
May be this helps:
dat1<- as.data.frame(table1)
 dat2<- as.data.frame(table2)
names(dat2)<-c("V3","V4")
library(plyr)
res<-join(dat1,dat2,type="full")
 res[is.na(res)]<- 0
 res
#  V1 V2 V3 V4
#1  1  1  0  0
#2  1  2  0  0
#3  0  0  0  1
#4  0  0  0  4
 combinedtable<-as.matrix(res)
 colnames(combinedtable)<- NULL
 combinedtable
#     [,1] [,2] [,3] [,4]
#[1,]    1    1    0    0
#[2,]    1    2    0    0
#[3,]    0    0    0    1
#[4,]    0    0    0    4
A.K.



>Hi, 
>
 >I am trying to combine multiple tables into one, where the 
elements that are created as a result of the merge to be filled with 
zeroes. 
>
>In other words, to go from this: 
>
>#Create tables to combine 
>row1 <- c(1,1) 
>row2 <- c(1,2) 
>row3 <- c(0,1) 
>row4 <- c(0,4) 
>table1 <- rbind(row1,row2) 
>table2 <- rbind(row3, row4) 
>table1 
 >         [,1] [,2] 
>row1    1    1 
>row2    1    2 
>table2 
  >        [,1] [,2] 
>row3    0    1 
>row4    0    4
>
>To this: 
>
>#What the combined table should look like if things worked out 
>newrow1 <- c(1,1,0,0) 
>newrow2 <- c(1,2,0,0) 
>newrow3 <- c(0,0,0,1) 
>newrow4 <- c(0,0,0,4) 
>combinedtable <- rbind(newrow1, newrow2, newrow3, newrow4) 
>combinedtable 
  >                [,1] [,2] [,3] [,4] 
>newrow1    1    1    0    0 
>newrow2    1    2    0    0 
>newrow3    0    0    0    1 
>newrow4    0    0    0    4
>
>I tried merge() but it 
doesn't make any sense here, and I also tried to melt() the orginal data
 that table1 and table2 are created from to re-created >a "combined" 
table from one step further back from this but couldn't get it to form 
the right table. 
>
>If that would be an easier solution, here is the starting point 
that table1 and table2 are created from and also the create.table() 
function I wrote to >create them: 
>
>create.table <- function(a,b){ 
 >   obs <- unique(c(a,b)) 
  >  squ <- matrix(rep(0,length(obs)^2),ncol=length(obs)) 
   > for(i in 1:length(obs)){ 
    >    for(j in 1:length(obs)){ 
  >          squ[i,j] <- sum((a==obs[i])*(b==obs[j]), na.rm=TRUE) 
  >      } 
  >  } 
  >  squ 
>} 
>
>#Mock data 
>sampleid <- c(1:5) 
>Q1before <- c(0,0,1,0,1) 
>Q1after <- c(0,1,0,0,1) 
>Q2before <- c(1,0,0,0,0) 
>Q2after <- c(0,0,0,0,0) 
>
>#This is what my real data looks like 
>#It may be easier to reformat this df to a format that could then 
use my create.table() function to get to the combined table endpoint? 
>mydf <- as.data.frame(cbind(sampleid,Q1before, Q1after, Q2before, Q2after)) 
>create.table(mydf$Q1before, mydf$Q1after) 
>create.table(mydf$Q2before, mydf$Q2after)
>
>I hope at least some of this makes sense. Thank you for your input, you guys are always the best!