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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 dblumling[/i] [br]Origin Ver. and Service Release (Select Help-->About Origin): 7.0 Operating System: XP I'm trying to fit some fluorescence lifetime decay data which includes an instrument response function on the leading edge of the decay. I'm sure the data can be fit using a convolution of a Gaussian and an exponential decay curve, but I'm having trouble writing a script for it (this being my first attempt at this type of thing). I'm using Origin 7.0, and as such I've been plotting my data as a scatter plot with x and y columns, then opening the advanced nonlinear curve fitting function under Analysis. Using the "define new function" option, I've been trying to follow the approach detailed in a past post, http://www.originlab.com/forum/topic.asp?TOPIC_ID=5644&SearchTerms=gaussian,exponential,decay,7.0 but the original author seems to have solved his problem without detailing his solution. Any advice or suggestions would be quite welcome, and I'll provide more details as needed. Thank you in advance! Daniel [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.