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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 alvaromoravi[/i] [br]Origin Ver. and Service Release (Select Help-->About Origin): OriginPro 2016 Operating System: Windows 7 Hi everybody! I am an Origin newbie. I am trying to plot a 3d surface over a nonuniform XY matrix. I have a set of XYZ points and I want to plot a surface interpolating them. As a simple example, let's say that my points are: X | Y | Z -5|3.1|-2.1 -5|2.6|-1.9 0 |3.2|-3.3 0 |2.7|-2.5 0 |2.2|-2.0 5 |3.1|-4.0 5 |2.6|-3.5 5 |2.1|-2.8 5 |1.7|-2.1 Moreover, my Z values are representing a logarithm, so I can not use a simple linear interpolation which would give me positive values. I do not know if it could be possible to truncate the surface for example at Z=-1.8. Thank you very much in advance. [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.