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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 sagar[/i] [br]Hi, I have random XYZ data for which I need to generate 3D surface plot. (XY values correspond to a position of wafer and Z value is current). Now, some XY values are missing. When I convert this data to random I have to use either correlation or weighted average. But what I am interestd is generating a surface plot where I can see "holes" for missing data points. Further, since my wafer is circular in nature, certain points (e.g. X,Y = 0,0) are non-existent. So I should be able to see a "circular surface". However, Origin converts it to matrix and it is, by definition, rectangular. So my questions here are: 1. Is there any way to show "voids" for missing values? and 2. How do I get rid of non-existent values from the matrix data? (e.g. edges on a wafer as mentioned above). Thanks a lot for your help. Regards, Sagar [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.