[R] Access to matrix values from labels

Hi everybody: I've a output interpolation matrix files, and my question is if are there anybody that could tell me how access to particular values of this matrix from labels. Thnaks in advance. -- Antoni Viúdez Mora Dept. Dinámica de

[R] Compare predict and experimental values

Hi everybody: I just generate different maps of interpolation with different methods but with the same package -(gstat, i used the krige command). And now for evaluate the best method i want to compare the predict values versus experimental, but i don't know how do it. Could anybody tell me how

[R] Access to particular predict value

Hi everybody: I just generate interpolation maps with differents methods, like IDW and kriging, and now i want to compare the predict values versus real, and i don't who is the commant to do it. I want for example, if I pass from console the coordinates of a place, return me the predict value.