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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 Joshua Wilson[/i] [br]OriginPro 2015 Academic Operating System: Win 7 I have some data from device simulations that I'd like a heat map of. The data is not regularly spaced in the y-direction and the first z-column is 1.99E+10 3.56E+10 7.03E+10 1.56E+11 4.00E+11 1.21E+12 4.42E+12 2.03E+13 1.22E+14 7.33E+14 3.38E+15 1.26E+16 4.01E+16 1.17E+17 3.47E+17 1.24E+18 7.29E+18 When I convert to a matrix using XYZ Gridding the first column is converted to: 1.9923E10 5.798E10 1.78555E11 5.13573E11 1.56319E12 4.77659E12 1.01348E13 2.39127E13 1.22018E14 [i][b]-2.55965E13[/b][/i] 1.86239E15 3.50662E15 5.9944E15 4.26972E16 7.61601E16 2.53708E17 7.2864E18 The data now contains negative values. This occurs regardless of which random gridding method I use. Am I doing something wrong? Or is it a bug? I know a similar problem was discussed here: [url]https://www.originlab.com/forum/topic.asp?TOPIC_ID=9859[/url], but I need a heat map with a spectrum bar for the z-values and it doesn't seem like that can be done with the contour plots. Thanks in advance for your help. Joshua Wilson [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.