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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 academic76[/i] [br]Origin Ver. and Service Release (Select Help-->About Origin): OriginPro 2017 -version assay Operating System: windows 7 I have read a publication from 2010 (doi:10.1039/b9nj00498j) and I would like to estimate parameters : K1,K2,G1,G2. G1,Mt are constants, G, a dependent variable (from experimental measurements) and Lt, independent variable. The code was written like that : double a; a=K1*K2; double b; b=K1-a*(Lt+2*Mt); double c; c=1*K1*(Mt-Lt); double d; d=-Lt; for (L=Lt,step=1;abs(step)>1e-15;L=L-step) {step=(a*L*L*L+b*L*L+c*L+D)/(3*a*L*L+2*b*L+c);}; G=(Gs+G1*K1*L+G2*K1*K2*L*L)/(1+K1*L+K1*K2*L*L) But it seems that the step function does not work. It allows to calculate square roots from a polynomial function (degree 3) (aL^3+bL^2+cL+d=0) by the Newton-Raphson procedure and then use L to calculate G. Could you help me to re-write, in the originPro 2017 version, something that would work... Thank you for your help.javascript:insertsmilie('[:)]') [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.