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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 vassilios_1[/i] [br]:( I'm trying to fit a selected part of a function curve. Although I use nlsf.dataBegin and nlsf.dataEnd my script uses always the complete x-column --> so the fit result is total rubbish. Here the code: [EXECFIT] nlsf.func$ = cubic; nlsf.dataBegin= Fstart; //some start value for fitting nlsf.dataEnd = Fend; nlsf.xBegin = fxdata[1]; //some start value for plotting the fit nlsf.xEnd = fxdata[2]; nlsf.cleanupfitdata(); nlsf.fitdata$ = Polyfit_TotMit; nlsf.xmode = 4; nlsf.funcx$ = Polyfit_PolyX; //dataset to store nlsf.funccol$ = Polyfit_PolyY; //dataset to store fitted Y values nlsf.iterate(20); nlsf.makecurve(func); //dataset generated for the fitted curve Has anyone an idea or working code? Thanks! :) [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.