All Forums  Origin Forum  Origin Forum  [emerg]Fitting xyz data to find a,b,c BUT ERROR

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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 leejuyeon[/i] [br]Origin Ver. and Service Release (Select Help-->About Origin): OriginPro 2019(64-bit) SR2 Operating System: window 10 [b]Emergency! Help! [xx(][/b] Hi, this is juyeon. I have the following problem: z=a+bx+cy I have a xyz-dataset and i need to find a,b,c parameter. I tried to do 'nonlinear curve fit' by referring to this post and the link to the post is (https://www.originlab.com/doc/Tutorials/Fitting-Datasets) . But, i got some error : Fit did not converge - reason unknow & Fit status code: 27 fit did not converge - reason unknowm. Does anyone know why I got an error?? [b]I think that I do not know how to do a non-linear fitting. Someone tell me how to do it. What I have is xyz-data, and what I need to get is ABC(parameter). z=a+bx+cy[/b] [The settings I used are as follows] -function model: explict - independent variables: x,y - dependent variables: z - parameter name: a,b,c - fuction : z= a+bx+cy [u]Here is the link to my previous-forum-post(THE SAME QUESTION) https://my.originlab.com/forum/topic.asp?TOPIC_ID=47516[/u] Ask me again if there's anything you don't understand. To solve this problem, I am willing to send you the data excel file, original opj file, or fit function file by email. Or, I would appreciate it if someone could tell me [b]how to ask the original lab-tech directly.[/b] I'll be waiting for your answer. Thank you. I'm in a hurry. This problem is killing me. This problem is an emergency for me. Give me an answer me ASAP. leejuyeon [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.