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T O P I C R E V I E W
LingC	Posted - 09/16/2012 : 8:22:52 PM Hello, I need to fit my data with the modulus of a complex function. I tried to use the "Imabs" command but the resulting curve do not with the simulation. I wonder if there is the correct way to define a function of modulus of a complex function. The following is what I have as a defined function, y=Imabs((-1ia2v+a1(1ig2x-x^2+w2^2))/(v^2+(-1ig1x+x^2-w1^2)(-1ig2x+x^2-w2^2)))+C Here a1,a2,w1,w2,g1,g2,v,C are fitting parameters.
2 L A T E S T R E P L I E S (Newest First)
Sam Fang	Posted - 09/20/2012 : 04:13:18 AM Imabs is a LabTalk function in Origin8.6, not an OriginC function. If you want to use it in OriginC function form, you need declare it first outside the function body in Code Builder dialog. e.g. ------------------------------------- double Imabs(complex cX); ------------------------------------- Sam OriginLab Technical Services
cc261	Posted - 09/19/2012 : 02:25:51 AM Have a look and try a software named 1stOpt or Auto2Fit, do complex function fit perfectly, and easy too.

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