3D smoothing

*To*: MathGroup <mathgroup at yoda.physics.unc.edu>*Subject*: 3D smoothing*From*: Tapio Luttinen <100013.2275 at compuserve.com>*Date*: 04 Jan 94 15:57:31 EST

Dear Mathgroupers, Does anyone have a good 3D smoothing package? I have several probability density estimates for vehicle headways at different flow levels. Now I want to make a surface plot of the densities across the volumes. I tried distance weighted least squares (of Systat), but that produced saddle points in the peak at unobserved flow rates. The density starts from zero, increases steeply to maximum and then decreases exponentially. The mode is constant at different flow rates, but peak height increases as the flow increases. Any help appreciated R. Tapio Luttinen +-----------------------------------------------------------------------+ | Tapio Luttinen Tel. (work) +358 (18) 752-4252 | | TL Consulting Engineers Ltd. Tel. (home) +358 (18) 756-3332 | | Kulmakatu 5 Tel. (mobile) +358 (49) 350-298 | | 15140 Lahti Fax +358 (18) 752-4253 | | FINLAND E-mail 100013.2275 at compuserve.com | +-----------------------------------------------------------------------+