Message-ID: <56165c52-c5a9-4a4c-963b-8fddb03db1ef@email.android.com>
Date: 2011-11-15T22:50:24Z
From: Jeff Newmiller
Subject: Convert back to lower triangular matrix
In-Reply-To: <1321396729.5830.YahooMailClassic@web161204.mail.bf1.yahoo.com>
This is R-help, not the linear algebra hotline. Please stay on topic.
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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.
>Your help will be greatly appreciated.JN
> [[alternative HTML version deleted]]
>
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