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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 analytik[/i] [br]Origin Version (Select Help-->About Origin): Origin 6.0 Operating System: Win2000 SP4 Hello everybody I would like to ask for help with fitting of multiple data sets. My problem is to find parameters of isotherm: q1=H*c + qs1*b1*c/(1+b1*c+b2*c) q2=H*c + qs2*b2*c/(1+b1*c+b2*c) This I known how to do it, but my problem is to satisfied following constrains: K1 = H + qs1*b1 K2 = H + qs2*b2 The parameters K1 and K2, I know from another experiment. I have been trying to apply these constrains, but Origin answer was that this constrains are not linear. I am doing this in Excel, but I am not pleased with a results. Do you have any suggestion how to do this? I would be big help for me. Thank you. Analytik [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.