All Forums  Origin Forum for Programming  Forum for Origin C  Creating a new Parameters Initialization Script

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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 mwmarmw[/i] [br]Hello, I am doing NLCF. My question is how do I set up parameter initialization for a function of the following form: y=k*(x^c)+l*(x^d)+a*(1-exp(-b*x)) I tried something like that: sort( x_y_curve ); //smooth( x_y_curve, 2 ); Dataset dx; x_y_curve.AttachX(dx); dx = ln(dx); x_y_curve = ln( x_y_curve ); Dataset coeff; coeff.SetSize(2); fitpoly( x_y_curve, 1, coeff); k= exp( coeff[0] ); c = coeff[1]; coeff.SetSize(3); fitpoly( x_y_curve, 1, coeff); l = exp( coeff[0] ); d = coeff[1]; int sign; double a1; b = -get_exponent_cuv(x_y_curve, &a1, &a, &sign); a = (a1-sign*exp(a)) / 2; but there is definitely some error in it (maybe in a different place of the function being built?), Because although the curve fits well, the parameters obtained have undefined values. I will appreciate any help [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.