[R] almost lower triangular matrices

From: Michael Anyadike-Danes <M.Anyadike-Danes_at_erini.ac.uk>
Date: Wed 02 Mar 2005 - 05:38:01 EST

I have output from a program which produces a distance matrix I want to read into a clustering program in R.  

The output is a .txt file and is 'almost' lower triangular in the sense that it is just the triangle below the diagonal.  

So for example a 4-by-4 distance matrix appears as,  


2 3

4 5 6  

i.e. it looks like a lower triangular of a 3-by3.  

I thought I might be able to use "diag" to add zeros but apparently not.  

It's a problem because my matrix is actually 1989-by-1989 not 4-by-4  

I would not be at all surprised if the solution is obvious but I cannot quite see how to read this into R.  

Michael Anyadike-Danes

Economic Research Institute of Northern Ireland    

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