I wonder whether a package for signal (not image) features extraction has ever been contributed to CRAN. We have a very crude signal classifier based on the absolute difference of the area subtended by the two signals being compared. We miss by far a lot of possibly important features. Thank you very much. Maura Alice Messenger ;-) chatti anche con gli amici di Windows Live Messenger e tutti i telefonini TIM! Vai su http://maileservizi.alice.it/alice_messenger/index.html?pmk=footer [[alternative HTML version deleted]]