At 08:19 PM 2/20/2003 +1000, you wrote: > You may be able to use a 2-D LUT with interpolation to give you DewPoint(t_C, RH). P.S. do a search on "bilinear interpolation" if you want to pursue this approach. Best regards, Spehro Pefhany --"it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu