consecutive numbering of elements in a matrix
if I understand what you want correctly, then one approach is: A <- matrix(sample(50, 21), 7, 3) A[sample(21, 5)] <- NA A row(A) - apply(is.na(A), 2, cumsum) I hope it helps. Best, Dimitris
Jim Bouldin wrote:
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
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Dimitris Rizopoulos Assistant Professor Department of Biostatistics Erasmus University Medical Center Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands Tel: +31/(0)10/7043478 Fax: +31/(0)10/7043014