[R] Please, help me with 'mattern' variogram

Jimmy Martina jimmyjuan1 at hotmail.com
Wed Nov 17 03:33:00 CET 2010

Hi, R-folks:
I have been tryin many combination of parameter to make Matern variogram to work, but I can't find the available one. I'm near to be crazy.
I tiped:
the hessian shows:
          [,1]           [,2]        [,3]      [,4]
[1,]  9.139986  -8.562736e+00   41.648355 -3.801615
[2,] -8.562736  3.351952e+159 -147.279881 -7.083089
[3,] 41.648355  -1.472799e+02  347.493191 -7.509035
[4,] -3.801615  -7.083089e+00   -7.509035 90.681917

Then, I put:  solve(Año2003Selg.lf$info.minimisation.function$hessian)
...and it's shown as following:
Error in solve.default(Año2003Selg.lf$info.minimisation.function$hessian) : 
  sistem is computationally singular: number of reciprocity condition= 1.05091e-159

on account of I work in Spanish, it's shown:
Error in solve.default(Año2003Selg.lf$info.minimisation.function$hessian) : 
  sistema es computacionalmente singular: número de condición recíproco = 1.05091e-159
I also wander if there is any limit for kappa. Which one would be the maximun. As far as I'm concerned, it must be always major than cero, right?. I also know that its values depend on the tendency of cloud semivariogram, if it flattens slowly (Gaussian) it's major.
I'll thank the one available to answer my desperate question. 		 	   		  

More information about the R-help mailing list