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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Anti-Spam Code: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by junsung[/i] [br]Origin Version (Select Help-->About Origin): 7.5853 Operating System: Window XP (SP2) Hi, all I tried to do some fitting with integration. I know there has been several discussons about fitting with integration, but I cannot find any related one. If I'm wrong, please let me know which topic I should have a look. My fitting function is like F[x] = Integral^(inf)_(-inf) {function(x.t)}dt. The integration has to be done for another parameter "t". I have tried with the following code, but I didn't get any values. Could you be kind to tell me why this is not working? Any comments or suggestions will be very helpful for me. In the NLSF. "Use Origin C" is on. -------------- static double astore, bstore; Dataset dst("Data1_t");//Data1_t already exists Dataset dsF("Data1_F");//empty Data1_f already exists Dataset dsX("Data2_x");//Data2_x already exists Dataset dsFF("Data2_FF");// empty Data2_FF already exists int nSize = dst.GetLowerBound(); int mSize = dsX.GetLowerBound(); if(a!=astore || b=bstore) { dsF.SetSize(nSize); for(int ii=0;ii<mSize; ii++) { dsF = a*exp(dst) + b*exp(dsX[ii]); Curve crv ("Data1_t", "Data1_F"); dsFF[ii] = area(crv); } astore=a ; bstore=b; }; y = Data_table( x, &dsFF, &dsX ) ; [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.