Convert a list to matrix
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 [[alternative HTML version deleted]]
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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