Dear there, I am running OCK for a number of datasets. The codes worked for the first five datasets and then I got an error message:
Linear Model of Coregionalization found. Good. [using ordinary cokriging] Linear Model of Coregionalization found. Good. [using ordinary cokriging] Linear Model of Coregionalization found. Good. [using ordinary cokriging] Linear Model of Coregionalization found. Good. [using ordinary cokriging] Linear Model of Coregionalization found. Good. [using ordinary cokriging]non-positive definite coefficient matrix in structure 1Error in predict.gstat(mud.ock.fit, newdata = data.file.pred) : gstat: value not allowed for: variograms do not satisfy a legal model I wonder what caused the problem and how to correct it? Any suggestions are appreciated. Givent that we have data of all secondary variables for each point of interest, I guess this would automatically lead to a co-located OCK. Is this assumption correct? As I remember, Edzer mentioned to use merge parameter to specify this, is there an example for this as a reference if we have to specify this? Thanks in advance. The scripts used are: file.read.dev<-paste(files.path.dev, dev.files[i], sep="") # create the path for the file to be imported in data.file.dev<-read.table(file.read.dev, header=TRUE, sep=",") file.read.pred<-paste(files.path.pred, pred.files[i], sep="") # create the path for the file to be imported in data.file.pred<-read.table(file.read.pred, header=TRUE, sep=",") coordinates(data.file.dev) = ~LON+LAT coordinates(data.file.pred) = ~LON+LAT #gridded require constant coordinate intervals, so we used coordinates instead #mud.ock <- gstat(id="md", formula=sqrt(mud)~1, data=data.file.dev, nmax=20) mud.ock <- gstat(id="md", formula=sqrt(mud)~1, data=data.file.dev) mud.ock <- gstat(mud.ock, "bathy", bathy~1, data.file.dev) mud.ock <- gstat(mud.ock, "dc", dist.coast~1, data.file.dev) mud.ock <- gstat(mud.ock, "sl", slope~1, data.file.dev) mud.ock <- gstat(mud.ock, model = vgm(1,"Sph",5,1), fill.all=T) x <- variogram(mud.ock) mud.ock.fit=fit.lmc(x, mud.ock) mud.pred<-predict(mud.ock.fit, newdata=data.file.pred) #plot(x, model=mud.ock.fit) mud.pred<- as.data.frame(mud.pred) mud.pred$bt.pred<-(mud.pred$md.pred)^2 mud.pred$bt.pred[mud.pred$bt.pred>=100]=100 Regards, Jin [[alternative HTML version deleted]] _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo