Thanks for the information. Yes, I'm referring to Michael Carter's package from the application centre. Does anyone have any comparisons between that and the commercial quaternion package from MapleConnect? The commercial package looks more comprehensive as you'd expect. Ray

Thanks for the information. Yes, I'm referring to Michael Carter's package from the application centre. Does anyone have any comparisons between that and the commercial quaternion package from MapleConnect? The commercial package looks more comprehensive as you'd expect. Ray