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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 Forum: LabTalk Forum Subject: Message: * HTML is OFF * Forum Code is ON Smilies Hello everybody, I'm completely new to the Origin Lab user forum, but I'm stuck with a problem and I'm pretty sure one of you can help me. I hava a large dataset1 with (50000 datapoints x y) were some data need to be extracted according to differnt x values. The x values for the exctraction are in another dataset2 (400 values), but not all of them needs to be used and I need the possibility to change them afterwards to see the results. I might know a logical way to achieve this, but I have no clue how to achieve this. 1st. Define constants from the dataset2 following a loop with different conditions (e.g. define every 5th datapoint as constant with name constI(ii), define every 10th datapoint as constII(ii) ...) 2nd. Extract datapoints from dataset2 y if x value is between const1(ii)+c and const2(ii)-d Does anyone knows an elegant way to achieve this? Cheers Leif Origin Ver. and Service Release (Select Help-->About Origin): OriginPro 2020 (64-bit) SR1 Operating System: Windows 10   Check here to subscribe to this topic.