Convert back to lower triangular matrix
1. Please post in plain text, not HTML (as the posting guide asks!) 2. This might actually be an R question -- is ?lower.tri what you want? -- Bert On Tue, Nov 15, 2011 at 2:50 PM, Jeff Newmiller
<jdnewmil at dcn.davis.ca.us> wrote:
This is R-help, not the linear algebra hotline. Please stay on topic. --------------------------------------------------------------------------- Jeff Newmiller ? ? ? ? ? ? ? ? ? ? ? ?The ? ? ..... ? ? ? ..... ?Go Live... DCN:<jdnewmil at dcn.davis.ca.us> ? ? ? ?Basics: ##.#. ? ? ? ##.#. ?Live Go... ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?Live: ? OO#.. Dead: OO#.. ?Playing Research Engineer (Solar/Batteries ? ? ? ? ? ?O.O#. ? ? ? #.O#. ?with /Software/Embedded Controllers) ? ? ? ? ? ? ? .OO#. ? ? ? .OO#. ?rocks...1k --------------------------------------------------------------------------- Sent from my phone. Please excuse my brevity. 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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______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Bert Gunter Genentech Nonclinical Biostatistics Internal Contact Info: Phone: 467-7374 Website: http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm