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repmat (was "Computing distance matrix robustly")

From: Mike Miller
Subject: repmat (was "Computing distance matrix robustly")
Date: Mon, 3 Oct 2005 09:31:42 -0500 (CDT)

On Sun, 2 Oct 2005, Søren Hauberg wrote:

D = sqrt( repmat(sX2, 1, n) + repmat(sX2', m, 1) - 2*XX );

Is there an advantage to using repmat instead of kron as follows:

kron(ones(m, n), X)


repmat(X, m, n)

They are pretty similar in speed from what I'm seeing. I've been using kron for this sort of thing and wonder if I should be using repmat. The newest version of kron is a fast .oct file but some older versions were much slower.


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