Thank you all for the replies! This is my solution now: // ======== Wrap around at June 1st ======== ix1 = find(log_date==datenum(log_data(1,3),06,01)) ix2 = [ix1+1:size(log_data,1),1:ix1]; dat2 = log_data(ix2,6); (which is much easier to read :-) -- Sent from: http://mailinglists.scilab.org/Scilab-users-Mailing-Lists-Archives-f2602246.html