one way is the following:
m <- list(A = 1, B = 1:2, C = 1:3, D = 1:4)
n <- max(sapply(m, length))
t(sapply(m, function (x) c(x, rep(NA, n - length(x)))))
I hope it helps.
Best,
Dimitris
Daren Tan wrote:
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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--
Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus University Medical Center
Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands
Tel: +31/(0)10/7043478
Fax: +31/(0)10/7043014
______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
