[GRASSLIST:1648] Computing Error Matrix

Hi Grass users,
                I have a training data set (in raster form) and a classified image ( which was classified with the help of the training data set). I want to compute A Classification Error Matrix to chech the accuracy of the classification. Can anybody tell me how to do ?. Thanks .

uttam.

_________________________________________________________________
BharatMatrimony.com. http://www.bharatmatrimony.com/cgi-bin/bmclicks1.cgi?74 India's premium matrimonial website.