Message-ID: <4278F8ED.2040207@pdf.com>
Date: 2005-05-04T16:31:41Z
From: Spencer Graves
Subject: rank of a matrix
In-Reply-To: <4278F018.8060101@unm.edu>
Have you considered something like the following:
matrix.rank <- function(A, eps=sqrt(.Machine$double.eps)){
sv. <- abs(svd(A)$d)
sum((sv./max(sv.))>eps)
}
matrix.rank(A=diag(3))
#[1] 3
A <- array(c(1,1,0,0), dim=c(2,2))
matrix.rank(A)
#[1] 1
mingan wrote:
>
>
> how do I check the rank of a matrix ?
>
> say
>
> A= 1 0 0
> 0 1 0
>
> then rank(A)=2
>
> what is this function?
>
> thanks
>
>
> I did try help.search("rank"), but all the returned help information
> seem irrelevant to what I want.
>
> I would like to know how people search for help information like this.
>
>
>
>
>
>
> rank(base) Sample Ranks
> SignRank(stats) Distribution of the Wilcoxon Signed Rank
> Statistic
> Wilcoxon(stats) Distribution of the Wilcoxon Rank Sum
> Statistic
> friedman.test(stats) Friedman Rank Sum Test
> kruskal.test(stats) Kruskal-Wallis Rank Sum Test
> pairwise.wilcox.test(stats)
> Pairwise Wilcoxon rank sum tests
> wilcox.test(stats) Wilcoxon Rank Sum and Signed Rank Tests
>
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