removeing only rows/columns with "na" value from square ( symmetrical ) matrix.
Your problem is not well-defined. In your example below, why not remove rows 1,2,6, and 10, all of which contain NA's? Is the matrix supposed to be symmetric? Do NA's always occur symmetrically? You either need to rethink what you want to do or clarify your statement of it. -- Bert
On Sun, May 20, 2012 at 7:17 AM, Nevil Amos <nevil.amos at monash.edu> wrote:
I have some square matrices with na values in corresponding rows and columns. M<-matrix(1:2,10,10) M[6,1:2]<-NA M[10,9]<-NA M<-as.matrix(as.dist(M)) print (M) ? ?1 2 3 4 5 6 7 8 9 10 1 ? 0 ?2 1 2 1 NA 1 2 ?1 ?2 2 ? 2 ?0 1 2 1 NA 1 2 ?1 ?2 3 ? 1 ?1 0 2 1 ?2 1 2 ?1 ?2 4 ? 2 ?2 2 0 1 ?2 1 2 ?1 ?2 5 ? 1 ?1 1 1 0 ?2 1 2 ?1 ?2 6 ?NA NA 2 2 2 ?0 1 2 ?1 ?2 7 ? 1 ?1 1 1 1 ?1 0 2 ?1 ?2 8 ? 2 ?2 2 2 2 ?2 2 0 ?1 ?2 9 ? 1 ?1 1 1 1 ?1 1 1 ?0 NA 10 ?2 ?2 2 2 2 ?2 2 2 NA ?0 How do I remove just the row/column pair( in this trivial example row 6 and 10 and column 6 and 10) containing the NA values? so that I end up with all rows/ columns that are not NA - e.g. ?1 2 3 4 5 7 8 9 1 0 2 1 2 1 1 2 1 2 2 0 1 2 1 1 2 1 3 1 1 0 2 1 1 2 1 4 2 2 2 0 1 1 2 1 5 1 1 1 1 0 1 2 1 7 1 1 1 1 1 0 2 1 8 2 2 2 2 2 2 0 1 9 1 1 1 1 1 1 1 0 if i use na omit I lose rows 1,2,6, and 9 which is not what I want. thanks -- Nevil Amos Molecular Ecology Research Group Australian Centre for Biodiversity Monash University CLAYTON VIC 3800 Australia ? ? ? ?[[alternative HTML version deleted]]
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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