R help - Oct 2006 - Mantel test!

Dear Sir/ Madam,
 
I would like to ask you about mantel test in R. In ade4 package, if I
want to use mantel.rtest, I get error massage "Object of class to
"dist"
expected". As I already have two dissimilarity matrices, shall I again
compute distance measure using this function?
If not, could you please let me know which function/command I can use to
do?
Thank you very much in advance and have a nice day!
 
Best regards,
Hossein
 
 
_______________________________
 Hossein Moradi
PhD Student
Institute of Environmental Sciences
University of Zurich
Winterthurerstrasse 190
Switzerland
Tel: +41 1 635 61 18
Fax: +41 1 635 57 11
E-mail:  <mailto:moradi@uwinst.unizh.ch> moradi@uwinst.unizh.ch
 

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On Fri, 2006-10-13 at 14:07 +0200, Hossein Moradi wrote:
> Dear Sir/ Madam,
>  
> I would like to ask you about mantel test in R. In ade4 package, if I
> want to use mantel.rtest, I get error massage "Object of class to
"dist"
> expected". As I already have two dissimilarity matrices, shall I again
> compute distance measure using this function?
> If not, could you please let me know which function/command I can use to
> do?
> Thank you very much in advance and have a nice day!
>  
> Best regards,
> Hossein
If the dissimilarity matrices are full, square, symmetric matrices, then
you can use:

mantel.rtest(as.dist(your_mat1), as.dist(your_mat2))

See ?as.dist

HTH

G

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