#Exponential curve fitting igor pro plus

Variable dT = max ( 5, abs ( round (pw /10 ))) //fs We will use a tenth of the pw as our resolution | pw=t1, the decay (1/e) time of the first exponential | pw=w the gaussian width(measured by cross-correlation) Return w + (t >=w ) *w * erf ((t -w ) /w ) CurveFitDialog/ Independent Variables 1 CurveFitDialog/ make the function less convenient to work with in the Curve Fitting dialog. CurveFitDialog/ These comments were created by the Curve Fitting dialog. An error function that is trunctated at t0 Same as above but written in the traditional style so that if can be used This function is written as an all at once function and a slower, exponential, vibrational response Models the kerr effect, which includes an instantaneous electronic response | w=t1, the decay (1/e) time of the first exponential | w=w the gaussian width(measured by cross-correlation) | w contains the parameters needed for the convolution and exponential functions.

#Exponential curve fitting igor pro plus

| This function models the decay of an intermediate plus an exponential decay convoluted with an exponential |This function was written by David Hoffman 5/2011 Val +=2*t 1*width * Exp ( - (t /width ) ^2 )įunction IntermediateDecayPlus1 (w,t ) : FitFunc | w = t1 inverse rate for A1->A2 and A2->A3 | In this case there is only 1 time constant | This function models the decay of an intermediate convoluted with an exponential plus one more exponential |This function was written by David Hoffman 10/2012 | w = w gaussian width of the cross correlation Make /D/O/N= ( numpnts (yw )) myTempWave = 0 Make a temp wave to hold the intermediate results Yw =0 //set the target wave to zero, we'll be adding to it later Variable length = numpnts (pw ) //how many parameters? data when the Raman pump is short enough to truncate the FID of the vibrational coherence. This is useful for fitting RINE ((1) McCamant, D. An all at once style function that simulates dispersive gaussians combinations of exponentials convoluted with an instrument response function which Various fitting functions for analyzing FSRS and ISRS data, predominantly various #pragma rtGlobals =3 // Use modern global access method.