How to convert adjacency list to adjacency matrix in R?

I have adjacency list in the form of:

1.  3,4
2.  4
3.  1,4
4.  1,2,3

and I want to transform into adjacency matrix using R. I have tried various commands like transformation of adjacency list to igraph object and then retransformation of igraph to adjacency matrix, but the obtained adjacency matrix is S4 class. I want simple commands to transform adjacency list to adjacency matrix in R.

data

 list(c(1L, 3L, 4L, 8L, 14L, 31L, 2L, 29L, 33L, 7L, 11L, 17L, 
5L, 6L, 34L), c(2L, 3L, 4L, 8L, 9L, 12L, 13L, 14L, 18L, 22L, 
1L, 10L, 33L, 34L), c(2L, 3L, 4L, 8L, 9L, 12L, 13L, 14L, 18L, 
20L, 22L, 32L, 1L, 31L, 34L, 24L), c(2L, 3L, 4L, 5L, 6L, 7L, 
8L, 9L, 11L, 12L, 13L, 14L, 18L, 20L, 22L, 1L, 31L, 10L, 28L, 
29L), c(4L, 5L, 6L, 7L, 8L, 9L, 11L, 12L, 13L, 14L, 18L, 20L, 
22L, 32L, 1L, 17L), c(4L, 5L, 6L, 7L, 8L, 9L, 11L, 12L, 13L, 
14L, 18L, 20L, 22L, 32L, 1L, 17L), c(4L, 5L, 6L, 7L, 8L, 9L, 
11L, 12L, 13L, 14L, 18L, 20L, 22L, 32L, 1L, 17L), c(2L, 3L, 4L, 
5L, 6L, 7L, 8L, 9L, 11L, 12L, 13L, 14L, 18L, 20L, 22L, 32L, 1L, 
31L, 10L, 28L, 29L), c(2L, 3L, 4L, 5L, 6L, 7L, 8L, 9L, 11L, 12L, 
13L, 14L, 18L, 20L, 22L, 32L, 10L, 28L, 29L, 33L, 34L, 15L, 16L, 
19L, 21L, 23L, 24L, 30L, 31L, 27L), c(2L, 4L, 8L, 9L, 10L, 14L, 
28L, 29L, 33L, 15L, 16L, 19L, 20L, 21L, 23L, 24L, 27L, 30L, 31L, 
32L), c(4L, 5L, 6L, 7L, 8L, 9L, 11L, 12L, 13L, 14L, 18L, 20L, 
22L, 32L, 1L, 17L), c(2L, 3L, 4L, 5L, 6L, 7L, 8L, 9L, 11L, 12L, 
13L, 14L, 18L, 20L, 22L, 32L), c(2L, 3L, 4L, 5L, 6L, 7L, 8L, 
9L, 11L, 12L, 13L, 14L, 18L, 20L, 22L, 32L), c(2L, 3L, 4L, 5L, 
6L, 7L, 8L, 9L, 11L, 12L, 13L, 14L, 18L, 20L, 22L, 32L, 1L, 31L, 
10L, 28L, 29L, 33L, 15L, 16L, 19L, 21L, 23L, 24L, 27L, 30L), 
    c(9L, 15L, 16L, 19L, 21L, 23L, 24L, 30L, 31L, 32L, 10L, 14L, 
    20L, 27L, 28L, 29L), c(9L, 15L, 16L, 19L, 21L, 23L, 24L, 
    30L, 31L, 32L, 10L, 14L, 20L, 27L, 28L, 29L), c(1L, 7L, 11L, 
    17L, 5L, 6L), c(2L, 3L, 4L, 5L, 6L, 7L, 8L, 9L, 11L, 12L, 
    13L, 14L, 18L, 20L, 22L, 32L, 31L), c(9L, 15L, 16L, 19L, 
    21L, 23L, 24L, 30L, 31L, 32L, 10L, 14L, 20L, 27L, 28L, 29L
    ), c(3L, 4L, 5L, 6L, 7L, 8L, 9L, 11L, 12L, 13L, 14L, 18L, 
    20L, 22L, 32L, 31L, 10L, 15L, 16L, 19L, 21L, 23L, 24L, 27L, 
    28L, 29L, 30L), c(9L, 15L, 16L, 19L, 21L, 23L, 24L, 30L, 
    31L, 32L, 10L, 14L, 20L, 27L, 28L, 29L), c(2L, 3L, 4L, 5L, 
    6L, 7L, 8L, 9L, 11L, 12L, 13L, 14L, 18L, 20L, 22L, 32L, 31L
    ), c(9L, 15L, 16L, 19L, 21L, 23L, 24L, 30L, 31L, 32L, 10L, 
    14L, 20L, 27L, 28L, 29L), c(24L, 25L, 32L, 3L, 34L, 27L, 
    33L, 9L, 15L, 16L, 19L, 21L, 23L, 30L, 31L, 10L, 14L, 20L, 
    28L, 29L), c(24L, 25L, 32L, 34L, 26L, 29L), c(26L, 28L, 30L, 
    33L, 34L, 32L, 25L, 29L), c(24L, 27L, 33L, 9L, 10L, 14L, 
    15L, 16L, 19L, 20L, 21L, 23L, 28L, 29L, 30L, 31L, 32L), c(4L, 
    8L, 9L, 10L, 14L, 28L, 29L, 33L, 26L, 30L, 32L, 15L, 16L, 
    19L, 20L, 21L, 23L, 24L, 27L, 31L), c(1L, 4L, 8L, 9L, 10L, 
    14L, 28L, 29L, 33L, 25L, 26L, 15L, 16L, 19L, 20L, 21L, 23L, 
    24L, 27L, 30L, 31L, 32L), c(26L, 28L, 30L, 33L, 34L, 9L, 
    15L, 16L, 19L, 21L, 23L, 24L, 31L, 32L, 10L, 14L, 20L, 27L, 
    29L), c(1L, 3L, 4L, 8L, 14L, 18L, 20L, 22L, 31L, 33L, 34L, 
    9L, 15L, 16L, 19L, 21L, 23L, 24L, 30L, 32L, 10L, 27L, 28L, 
    29L), c(3L, 5L, 6L, 7L, 8L, 9L, 11L, 12L, 13L, 14L, 18L, 
    20L, 22L, 32L, 26L, 28L, 24L, 25L, 15L, 16L, 19L, 21L, 23L, 
    30L, 31L, 10L, 27L, 29L), c(1L, 2L, 9L, 10L, 14L, 28L, 29L, 
    33L, 31L, 34L, 26L, 30L, 24L, 27L), c(1L, 3L, 31L, 33L, 34L, 
    2L, 26L, 30L, 24L, 25L, 9L))

Solution

Suppose el is a list of edge list:

el = list(c(3,4),
          c(2,4),
          c(1,4),
          c(1,2,3))

#Get the matrix dimension
dim <- length(el)

m <- sapply(el, function(x) { r<-rep(0,dim); r[unlist(x)]<-1;r})
     [,1] [,2] [,3] [,4]
[1,]    0    0    1    1
[2,]    0    1    0    1
[3,]    1    0    0    1
[4,]    1    1    1    0