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R: convert asymmetric list to matrix - number of elements in each sub-list differ

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r

I have an asymmetric list, i.e., the number of elements in each sub-list differ. How can I convert the list to a matrix?

Below I begin with a symmetric list and convert it to a matrix two different ways.

# create a symmetric list

my.list1    <- list(c(1,2,3,4),c(5,6,7,8),c(9,10,11,12))
my.list1

# convert symmetric list to a matrix

mat.a1  <- matrix( unlist(my.list1), nrow=length(my.list1), byrow=T )
mat.a1

# alternative method to convert symmetric list to a matrix

mat.b1 <- do.call(rbind, my.list1)
mat.b1

Next I create an asymmetric list:

# create an asymmetric list

my.list2   <- list(c(1,2,3,4),c(5,6,7,8,9),c(10,11,12,13))
my.list2

Here is the desired matrix:

# desired result

#      [,1] [,2] [,3] [,4] [,5]
# [1,]    1    2    3    4   NA
# [2,]    5    6    7    8    9
# [3,]   10   11   12   13   NA
like image 259
Mark Miller Avatar asked Jun 21 '12 23:06

Mark Miller


1 Answers

First, extend each vector in your list with NAs to get vectors of the same length. Then create your matrix. For example:

max.len <- max(sapply(my.list2, length))
corrected.list <- lapply(my.list2, function(x) {c(x, rep(NA, max.len - length(x)))})
mat <- do.call(rbind, corrected.list)
like image 185
ALiX Avatar answered Nov 01 '22 15:11

ALiX