On Nov 15, 2009, at 4:11 PM, martin08 wrote:
Hi all,
I am new to R. Can someone please give me some hints in how to do the
following things:
1- Get ONE permutation of a set. I have looked at the gregmisc
package's
permutations() method, but I just want to get one permutation at a
time.
Assuming that set1 is your set object and x is <= number of
permutations of z things from set1, then
permutations(set1, z)[x] will give your the x-th permutation.
the "[" operator/function can often be appended to the end of a
function to extract the desired subset.
2- Simulate a Markov chain in R. For instance, I want to simulate
the simple
random walk problem, in which a person can walk randomly around 4
places. I
know how to set up the transition matrix in R. I'm stuck at what to
do next.
Learn to search for yourself:
http://search.r-project.org/cgi-bin/namazu.cgi?query=%22transition+matrix%22+markov&max=100&result=normal&sort=score&idxname=Rhelp08&idxname=Rhelp02
I'm grateful if someone can give me hint or a pointer.
Thanks.
Martin
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