All Forums  Origin Forum  Origin Forum  Nonlinear Curve Fitting with Dataset Points

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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 matteo987[/i] [br]Origin Ver. 9.1 Service Release 3 I would like to fit some data (metal resistivity VS temperature) to a function defined as a numerical integral (so far I can do it). The problem is that I cannot write the integrand f(x) as a simple expression. It is indeed in the form f(x)=g(x)h(x) where I have an expression for g(x) but only dataset points for h(x). In my specific case h(x) is a phonon dispersion curve in the form of a two-column dataset. I would like to define an "interpolation function" on this dataset that I can then easily use as an integrand in my fitting function. I lack both time and experience with OriginLab. I was wondering if there were any easy way to do it. Thanks for your attention. [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.