search for: randvalu

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2011 Jul 02
5
%dopar% parallel processing experiment
dear R experts--- I am experimenting with multicore processing, so far with pretty disappointing results. Here is my simple example: A <- 100000 randvalues <- abs(rnorm(A)) minfn <- function( x, i ) { log(abs(x))+x^3+i/A+randvalues[i] } ?## an arbitrary function ARGV <- commandArgs(trailingOnly=TRUE) if (ARGV[1] == "do-onecore") { ?library(foreach) ?discard <- foreach(i = 1:A) %do% uniroot( minfn, c(1e-20,9e20), i ) } els...
2003 Oct 06
0
randomizing within factors and combining unequal-sized arrays
...n unchanged. For example, starting with an array: 10,11,12,20,21,22, which has been factored into two groups that lie between 10 and 19 and 20 and 29, I want to end up with an array that might look like this: 11,10,12,22,21,20 I can generate the randomized values using a statement of the form: randvalues = tapply(values,grouped.ranks,sample). How do I get these randomized values back into the original array, so that each factored subsample of the array now has its values randomized within that subsample? At the same time, I do not want to mix up the array too much by substituting values in...