On Sat, 8 Jan 2011, Ron Michael wrote:
Hi, I have 2 questions on list object:
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1. Suppose I have a matrix like:
dat <- matrix(1:9,3)
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Now I want to replicate this entire matrix 3 times and put entire result in a list
object. Means, if "res" is the resulting list then I should have:
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res[[1]]=dat, res[[2]]=dat, res[[3]]=dat
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How can I do that in the easilest manner?
See
?rep
...
Examples
...
## replicate a list
...
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2. Suppose I have 2 list objects:
list1 <- list2 <- vector("list", length=2)
for(i in 1:2) {
??list1[[i]] <- matrix(rnorm(15), 3)
??list2[[i]] <- matrix(rnorm(15), 3)
?}
How can I add these 2 list objects? I have tried with just list1+list2, however
it is generating some error.
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See
?mapply
take note of the SIMPLIFY arg, which you want as FALSE
HTH,
Chuck
Would be grateful for any help.
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Thanks,
[[alternative HTML version deleted]]
Charles C. Berry Dept of Family/Preventive Medicine
cbe...@tajo.ucsd.edu UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/ La Jolla, San Diego 92093-0901
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