I would like to convert a list to matrix. This can be easily achieved via
do.call. The only problem is each element of the list has different length,
which causes the recycling of values. How can I have NA instead of recycled
values ?
m <- list()
m[["A"]] <- 1
m[["B"]] <- 2:3
do.call(rbind, m)
[,1] [,2]
A 1 1
B 2 3
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