On Thu, 2007-12-06 at 15:47 -0700, Michael Perdue wrote: > if the i.pca is capable of divulging the eigenvectors, you can use > r.mapcalc to apply them in reverse. else; FYI, I modified i.pca awhile back to write eigenvectors to all output histories and properly handle null cells. -- 73, de Brad KB8UYR/6 <rez touchofmadness com>