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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 XZ_laser[/i] [br]I am using Origin 8.0.63.988 SR6. I don't know if the issue I encounter is still around in the later software versions. I have been trying to perform linear or 2nd order polynomial fits on sets of data. The tricky thing is that the data points I want to use are not contiguous: one set is near the beginning, one set is near the end, and there is a sizable set of data that I don't want to use in between them. The main method that I have been using with good success is to first record down the row numbers of the data points that I want to use, duplicate the data set, and then delete out the rows that I don't need. Curve fitting on truncated data is fast (less than a second). I then discovered the data masking feature, and masked the row numbers that I don't need. However, while curve fitting still works, it's now very, very slow (more than a minute). Any idea why Origin is behaving like this? For the record, the total number of rows in my data is 10001. For the fitting, I only use <400 rows total worth of data, or about 200 contiguous rows near the beginning and the same number near the end. [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.