Thanks alot.
Unfortunately I can not apply this to much bigger matrices as I can not visually check all the components.

Regards
Alex

--- On Tue, 5/31/11, Scott Chamberlain <scttchamberlain4@gmail.com> wrote:

From: Scott Chamberlain <scttchamberlain4@gmail.com>
Subject: Re: [R] where two matrices differ?
To: "Alaios" <alaios@yahoo.com>
Cc: R-help@r-project.org
Date: Tuesday, May 31, 2011, 2:56 PM


            The following returns zeros where elements do match, and NaN's where they don't match

mat1 <- matrix(c(1,2,1,2), 2, 2)mat2 <- matrix(c(0,0,1,2), 2, 2)
mat1 %% mat2

                
                
______________________Scott ChamberlainRice University, EEB Dept.

                
                On Tuesday, May 31, 2011 at 8:41 AM, Alaios wrote:
                
                    Dear all,
I have a few matrices that are roughly the same (same dimensions).
How I can find fast which are the elements that differ?

Best Regards
Alex

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