Message-ID: <200911211834.nALIYTG1006764@biglossa.ucdavis.edu>
Date: 2009-11-21T18:34:29Z
From: Jim Bouldin
Subject: consecutive numbering of elements in a matrix
Within a very large matrix composed of a mix of values and NAs, e.g, matrix A:
[,1] [,2] [,3]
[1,] 1 NA NA
[2,] 3 NA NA
[3,] 3 10 17
[4,] 4 12 18
[5,] 6 16 19
[6,] 6 22 20
[7,] 5 11 NA
I need to be able to consecutively number, in new columns, the non-NA
values within each column (i.e. A[1,1] A[3,2] and A[3,3] would all be set
to one, and subsequent values in those columns would increase by one, until
the last non-NA value is reached, if any).
Any ideas?
Thanks
Jim Bouldin, PhD
Research Ecologist
Department of Plant Sciences, UC Davis
Davis CA, 95616
530-554-1740