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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 Heckisack[/i] [br]Hello, ich have a problem with a function i created a long time ago and now have to use again but i doesn't work as i used it the last time. The fit function uses interpolated data of rheology measurements and looks like this: if(T>b5+p*b6){ V=(bm1+bm2*(T-(b5)))*(1-0.0894*ln(1+p/(bm3*exp(-bm4*(T-b5))))); } else{ V=(bs1+bs2*(T-b5))*(1-0.0894*ln(1+p/(bs3*exp(-bs4*(T-b5)))))+b7*exp(b8*(T-b5)-b9*p); }; I have 7 interpolated curves that represent different p (pressure) values. The problem i have now is that this fit should calculate one (!) set of bm1, bm2, bm3 etc. for different values of p. I know that i had to activate or deactivate something so that origin does not calculate different sets for each p, but i tried out everything and still can't remember what i have to change. Hopefully someone here can help. If it's important, function type is set to Y-form (German Version). Kind Regards, Tobias Origin Ver. and Service Release (Select Help-->About Origin): 8.6.0G Operating System: Windows 7 [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.