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syntax for a list of components from a list
2 messages · Maas James Dr (MED), Joshua Wiley
Hi,
On Thu, Jan 20, 2011 at 6:59 AM, Maas James Dr (MED) <J.Maas at uea.ac.uk> wrote:
I'm attempting to generalise a function that reads individual list components, in this case they are matrices, and converts them into 3 dimensional array. ?I can input each matrix individually, but want to do it for about 1,000 of them ... This works array2 <- abind(list1[[1]],list1[[2]],list1[[3]],along=3) This doesn't array2 <- abind(list1[[1:3]],along=3)
This is close, but using the `[[` operator is not quite what you want here. myl <- rep(list(matrix(1:9, 3)), 9) length(myl) # look at the length of the list (9) myl[1:3] # select elements 1:3 of the list ## Contrast this with: myl[[1:2]] # select the 1st element of the list, then the 2nd element of that myl[[c(3, 1)]] # 3rd element of list, 1st element of that ## This does what you want I think require(abind) # load relevant package abind(myl[1:3], along = 3) Cheers, Josh
This doesn't either array2 <- abind((list1[[1]]:(list1[[3]]),along=3) Any thoughts how I can make this work for larger numbers? Thanks J =============================== Dr. Jim Maas University of East Anglia ? ? ? ?[[alternative HTML version deleted]]
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Joshua Wiley Ph.D. Student, Health Psychology University of California, Los Angeles http://www.joshuawiley.com/