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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 fliozzi[/i] [br]v8.6Sr2. 32 bits trial mode Operating System: Windows 7 x64 Hello, is there any way to adjust implicit functions with origin? For example the full diode equation I=Io*(exp((V-I*Rs)/(n*Vt))-1). For fit this ecuation, i use Mathematica V8. I suppose a function F(V,I)=0; in this case F(V,I)=Io*(exp((V-I*Rs)/(n*Vt))-1)-I. Now I create the trio of experimental values (xi, yi, 0) and fit the function of two variables F(V,I) for the parameters Io, Rs and n. How I can do this in origin? Please fit implicit function is importat in ingeniering. Please incorporate it into future releases. But broken promises. Do it. Lambert W funtion too. Thanks. I`am electronic engineering student. [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.