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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 ssoubatch[/i] [br]Origin Version (Select Help-->About Origin): 7.5 SR6 Operating System: windowsXP I would like to program a fitting procedure. Four arrays of data are given A[i], B[i], C[i], and Dexp[i]. The fitted function has the following form: Dtheor[i]=X1*A[i]+sqrt(B[i])*cos(X2*C[i]), where X1 and X2 are fitting parameters. X1 is constrained between X1a and X1b, and X2 is constrained between X2a and X2b The procedure should fit Dtheor to Dexp returning X1 and X2 with errors. Unfortunately I am really new in Origin C and has no experience working with NLSF environment. So could you please help me or give a link to a proper description of it. Thanks a lot Sergey Edited by - ssoubatch on 03/31/2008 10:33:49 AM Edited by - ssoubatch on 03/31/2008 10:39:15 AM Edited by - ssoubatch on 03/31/2008 10:56:59 AM [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.