search for: neigbor

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2012 Jul 12
0
How to handle NA-values in raster-based Geary´s C test?
...st does not contain this option. The problem is that geary.test needs an nb argument for which I cannot perform for example nb<-ifelse(value, nb, NA), because it would change the nb-format to a list-format. Is there a way to ignore NA-values in geary.test? Or how can I set NA values in a neigbors (nb) list? Thank you very much, Kerstin --- file<-raster(test.tif") mask<-extent(file, 1, 50, 1, 50) subset<-crop(file,mask,test.tif", overwrite=TRUE) value <- as.matrix(subset) # Creation of a list of integer vectors giving the region id numbers for the neighbors withi...
2001 Jan 10
2
nearest neighbors
Is there an implementation of a reasonable k-nearest neighbor finder already in one of the packages? -- +---------------------------------------------------------------------------+ | Robert Gentleman phone : (617) 632-5250 | | Associate Professor fax: (617) 632-2444 | | Department of Biostatistics office: not yet