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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 Jambo Monty[/i] [br]Origin Version (7): Operating System: windows xp Hi, I want to fit the function: [img]/ftp/forum_and_kbase/Images/eq1a.bmp[/img] where: [img]/ftp/forum_and_kbase/Images/eq2.bmp[/img] The data to be fitted is I_DA(t). I am less concerned about the convolution with g(t) and the f terms, although any comments on these would be appreciated. The fit needs to determine the parameters a and b. c can be determined by normalisation. The question is really how to deal with the intgral over R. I tried modifying this example: [url]http://www.originlab.com/www/support/resultstech.aspx?ID=121&language=English[/url] but in my case the integral is over the variable R and not the independent variable (t). Any help would be much appreciated! Cheers [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.