All Forums  Origin Forum  Origin Forum  "linear" constraints in nonlinear fit

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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 karvek[/i] [br]Hi all, I am fitting some datasets with a user-defined function. I have something of the kind: f = Ax + By + Cz. A, B and C must be in the interval [-1,1] that I can set in the parameters bounds. However I would like to use as a general linear constraint something like abs(A) + abs(B) + abs(C) = 1. If I don't use the absolute value it works quite well but of course the sum is messed up by possible negative negative values of the parameters. Anyone has an idea on how to implement this? The function is written in Origin C. Origin 9.1 (64-bit) Sr2 Operating System: Windows 7 [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.