Recent content by zunzun

You can try the "function finder" on my curve and surface fitting web site, http://zunzun.com - it is free and won't cost anything to give it a try. You can limit the function finder to trigonometric equations only. The direct link is: http://zunzun.com/FunctionFinder/2/ If you need...

Not that I know of. James

The program peakfit might help: http://www.sigmaplot.com/products/peakfit/peakfit.php James

This function might be better since it has only three coefficients, and the terms are simple functions. RMSE = 0.0083, R-squared: 0.99999995, y = a( Temp(K) ) + b( 1/Temp(K) ) + c( ln(Temp(K)) ) a = -2.0624423802678490E-04 b = -5.1874919532864478E+04 c = 1.7768380294902535E+00...

You might consider: Ln(Kp) = a / (c * Temp + d)^b + Offset a = -1.4895890519700544E+04 b = 9.6571085998524553E-01 c = 3.3096509207808700E-01 d = -1.4626098473438096E+00 Offset = 1.5342375844418289E+01 as it fits with RMSE of 0.0061 and r-squared of 0.99999997, the fitting page is at...

You can do both 2D curve fitting and 3D surface fitting online at http://zunzun.com, and the Python source code is freely available under a liberal BSD-style license at Google source code repository: http://code.google.com/p/pythonequations/ James http://zunzun.com zunzun@zunzun.com