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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 sam132[/i] [br]Origin Ver. and Service Release (Select Help-->About Origin): 2018 Operating System: Windows 11 I need to fit a custom equation to one of my non -linear data. There were four parameters in the equation in which one of the parameter was fixed (say z =4, fixed). I had fitted all my data with this fixed parameter and the value of other parameters depends on the choice of z. But after further analysis , I found out that the value of z needs to be changed (say z =6). [b]Is there a way to update the z value and update the fitting, without redoing all the fit from scratch[/b]. [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.