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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 espenhjo[/i] [br]Origin Version (Select Help-->About Origin): 7.5 SR4 Operating System: WinXP I have the function find_roots_x in my workspace, compiled and linked. I also have a header file find_roots_x.h with the following content: #ifndef _FIND_ROOTS_X_H #define _FIND_ROOTS_X_H int find_roots_x(string strFunc1, double dXLo, double dXHi, double strFunc2); #endif This header file is included in nlsf.fit with the line: #include <find_roots_x.h> Even though I get error messages when I try to compile an NLSF function which calls the function find_roots_x: C:\Documents and Settings\ejohanne\Application Data\OriginLab\Origin75E\User Files\OriginC\NLSF\_nlfParPlaneOriginC.fit(50) :Error, function or variable find_roots_x not found I have used the same approach earlier with another function and then it worked. What could be wrong? -- Espen [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.