euclidean dist. between matrices
I may not understand correctly, but you have a matrix A with 15 rows and 365 columns and a second matrix B with 1 row and 365 columns. You say you want to compute the Euclidean distance between the first column of A (15 numbers) against B. That won't work since the first column of B is a single number, so I assume you want to compare each row of A with the single row of B computing a total of 15 Euclidean distances. If that is correct, there are a couple of possibilities: sapply(1:15, function(x) sqrt(sum((B-A[x,])^2))) Another approach would be to use function dist() and throw away the distances you don't need: head(dist(rbind(B, A)), 15) ---------------------------------------------- David L Carlson Associate Professor of Anthropology Texas A&M University College Station, TX 77843-4352
-----Original Message----- From: r-help-bounces at r-project.org [mailto:r-help-bounces at r- project.org] On Behalf Of eliza botto Sent: Saturday, November 17, 2012 8:08 PM To: r-help at r-project.org Subject: [R] euclidean dist. between matrices Dear Users,I have two matrices A=15*365 and B=1*365. i want to calculate "Euclidean Distance" between these matrices in such a
way
that i should have euclidean distance of matrix B against all the columns of matrix A. More precisely, first i want euclidean dist.
of
column 1 of A against B, then column 2 against B, 3rd column of A against B and so on.is there a way in r to do it?your help is
deeply
appreciated.. eliza [[alternative HTML version deleted]]
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