Message-ID: <CA+hbrhVxbESFv-DoE69-4MBQDKVy1kaYj2gV=9BbVknOVOYFzQ@mail.gmail.com>
Date: 2011-11-15T22:58:52Z
From: Peter Langfelder
Subject: Convert back to lower triangular matrix
In-Reply-To: <1321396729.5830.YahooMailClassic@web161204.mail.bf1.yahoo.com>
On Tue, Nov 15, 2011 at 2:38 PM, Juliet Ndukum <jpntsang at yahoo.com> wrote:
> Given a vector;> ab = seq(0.5,1, by=0.1)> ab[1] 0.5 0.6 0.7 0.8 0.9 1.0
> The euclidean distance between the vector elements is given by the lower triangular matrix?> dd1 = dist(ab,"euclidean")> dd1? ? 1 ? 2 ? 3 ? 4 ? 52 0.1 ? ? ? ? ? ? ? ?3 0.2 0.1 ? ? ? ? ? ?4 0.3 0.2 0.1 ? ? ? ?5 0.4 0.3 0.2 0.1 ? ?6 0.5 0.4 0.3 0.2 0.1
> Convert the lower triangular matrix to a full matrix> ddm = as.matrix(dd1)> ddm? ? 1 ? 2 ? 3 ? 4 ? 5 ? 61 0.0 0.1 0.2 0.3 0.4 0.52 0.1 0.0 0.1 0.2 0.3 0.43 0.2 0.1 0.0 0.1 0.2 0.34 0.3 0.2 0.1 0.0 0.1 0.25 0.4 0.3 0.2 0.1 0.0 0.16 0.5 0.4 0.3 0.2 0.1 0.0
> I would be grateful if someone could provide me with a code to convert ddm to the lower triangular matrix as before i.e. dd1
> ?above.
as.dist(ddm)
Peter