Re: AI-GEOSTATS: Re: Numerical method to solve kriging equations

2008-03-31 Thread Syed Shibli
ce > {LU lu(C); > Xc=lu.solve(c); > cout << "LU con C: " << Xc < > //LU with Varigram > {LU lu(V); > Xv=lu.solve(v); > cout << "LU con V: " << Xv < &

AI-GEOSTATS: Re: Numerical method to solve kriging equations

2008-03-28 Thread Isobel Clark
Adrian It is a common misconception that using the covariance (total sill - semi-variogram) rather than the semi-variogram brings more robust solutions. You get exactly the same answer either way since one is just a constant minus the other. You can avoid solution problems by simple

AI-GEOSTATS: Re: Numerical method to solve kriging equations

2008-03-28 Thread Adrian Martínez Vargas
What about to produce "pseudo covariance" to replace kriging matrix in term of variogram to make more efficient the numerical solution of the system? The ceros in the matrix diagonal are a problem in robustness and efficiency! Some one knows how to implement something like that? Papers/books