[R] Operating matrix positions

Charles C. Berry cberry at tajo.ucsd.edu
Thu Oct 11 19:48:41 CEST 2007

On Thu, 11 Oct 2007, Svempa wrote:

> I have two equally long lists of equally large matrices . I now want to
> generate a column that consists of the differences between position [i,j] in
> matrix k in each list. That is, the first position in this new column is
> 'position [1,1] in matrix 1 (of list 1)' minus 'position [1,1] in matrix 1
> (of list 2)', and so on, continuing to the next matrix as soon as the
> current one is searched through.
> It seems like an easy problem, but I cannot seem to get the loops correct.

Perhaps you want this or its transpose :

  	mapply( "-", list1, list2 )


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Charles C. Berry                            (858) 534-2098
                                             Dept of Family/Preventive Medicine
E mailto:cberry at tajo.ucsd.edu	            UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/  La Jolla, San Diego 92093-0901

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