If a is m x r and b is n x r then
apply(outer(a,t(b),"-"),c(1,4),function(x)sqrt(sum(diag(x*x)))) is the m x n matrix of distances between the m rows of a and n rows of b. Modify, as necessary, if you want distances other than euclidean. --- Date: Tue, 6 Jan 2004 13:07:41 -0500 From: <[EMAIL PROTECTED]> To: Erin Hodgess <[EMAIL PROTECTED]> Cc: <[EMAIL PROTECTED]>, <[EMAIL PROTECTED]> Subject: Re: [R] dist(x,y) Hi Erin, CLARIFICATION: I am looking for function which can calculate distances between rows in two different matrices (not in the same matrix as dist). Of course I can get the desired result by using rbind() and fiddling with indices of the result, which I already did, but I wonder if there is a function (or some variant of dist), which does it directly ? Ryszard Erin Hodgess <[EMAIL PROTECTED]> Sent by: [EMAIL PROTECTED] 01/06/2004 12:41 PM To: [EMAIL PROTECTED] cc: Subject: [R] dist(x,y) Hi Ryszard! There is a dist function in R. It's in the mva package. You can set the kind of distance that you want. Thanks, Erin mailto:[EMAIL PROTECTED] ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
