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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 mauricio.angeles[/i] [br]Origin Version (Select Help-->About Origin): 8.0 Operating System: Win Vista Hi everybody, I have been fitting a function that involves an integral in version 7.5, when I upgraded to version 8.0 the function did not worked. I have realized that a few features have been changed in version 8 like the way that data set are called within the funtion. The problem is that I cannot find the Curve_integrate object in 8.0 to perform the integration. My code is the following: static double kstore, astore, bstore; //static property retains the parameter values over iterations BOOL bErr; Dataset dsAi("Data1_Ai"); Dataset dsBi("Data1_Bi"); Dataset dsA("Data1_A"); Dataset dsB("Data1_B"); Dataset dsfun1("Data1_fun1"); Dataset dsfun2("Data1_fun2"); Dataset dsfun3("Data1_fun3"); Dataset dsfun("Data1_fun"); Dataset dsInteg("Data1_integ"); if(k!=kstore || a!=astore || b!=bstore) { //parameter checking dsfun1 = (dsAi-dsAi*dsA)^a; //vector notation dsfun2 = (dsBi-dsAi*dsA)^b; dsfun3 = dsfun1*dsfun2; dsfun = dsAi/dsfun3; Curve crvFitCurve( "Data1_A", "Data1_fun" ); Curve crvBaseline( "Data1_A", "Data1_zeros" ); IntegrationResult irMyResults; //dsInteg.SetSize(crvFitCurve.GetSize()); bErr = Curve_integrate( &crvFitCurve, &irMyResults, NULL, &dsInteg, TRUE ); // Perform integration kstore=k; astore=a; bstore=b; } y=Data_table(x, &dsInteg, &dsA)/k; I hope someone out there could help me. [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.