Message-ID: <48D68B54.70409@erasmusmc.nl>
Date: 2008-09-21T17:58:44Z
From: Dimitris Rizopoulos
Subject: Symmetric matrix
In-Reply-To: <139940.18844.qm@web58102.mail.re3.yahoo.com>
try the following
a <- matrix(rnorm(36), 6)
ind <- lower.tri(a)
a[ind] <- t(a)[ind]
a
I hope it helps.
Best,
Dimitris
Megh Dal wrote:
> I have following matrix :
>
> a = matrix(rnorm(36), 6)
>
> Now I want to replace the lower-triangular elements with it's upper-triangular elements. That is I want to make a symmetric matrix from a. I have tried with lower.tri() and upper.tri() function, but got desired result. Can anyone please tell me how to do that?
>
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>
--
Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus Medical Center
Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands
Tel: +31/(0)10/7043478
Fax: +31/(0)10/7043014