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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 sina1366[/i] [br]Origin Ver. and Service Release (Select Help-->About Origin): Operating System: Hi I have 8 functions, 8 dependent variables (y1,y2,...,y8), 2 independent variables (x1,x2) and 7 parameters (common in all functions). I want to fit 8 curves simultaneously with 8 functions. However, y1 to y4 are dependent on x1 and y5 to y8 are dependent on x2 (0<x1<0.3 and 0<x2<0.4). As simple example: y1 = A+B*x1 y2 = A+B*x1 . . . y5 = A+B*x2 y6 = A+B*x2 ... Is that possible to assign x1 to y1-y4 and x2 to y5-y8 and fit the curves? I have tried Function Form "Equations" but I couldn't get my target results! ss [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.