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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 ase724[/i] [br]Origin Ver. and Service Release (Select Help-->About Origin): Origin8.6.0 Operating System: Windows7 Hi, I am using origin C to write a user-defined function to fit my data. I have a function f(t,x) with an explicit variable x and an implicit variable t, so I do not have an explicit expression of f as a function of t. I was able to simulate the function and get a 2-dimension matrix f[t][x]. I want to make it into a fitting function to fit my data in a WorkBook with two columns {t, F(t, x=x_c)}. Since my data is taken at x=x_c, I just need a certain column from my simulation, f[t][x=x_c], to do the fitting. However, this is still a matrix, not an expression of a function, so I can not simply set y = f[t][x_c] as a fitting function. Is there a way I can use the simulated results to do the fitting? Thanks! [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.