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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 dashliu[/i] [br]Hi guys, I am facing a problem to convert the uniformly spaced data to matrix. I read this topic: "convert not uniformly spaced data to the matrix" on the page: http://www.originlab.com/forum/topic.asp?TOPIC_ID=6736 Per the suggestion of Laurie, I completed the conversion from worksheet to XYZ successfully with the help of script. Afterward, I tried to use ¡°Convert worksheet to matrix ¨C XYZ gridding ¨C Random (Renka Cline)¡±. The problem is the data shown on the converted matrix looks very weird. For instance, all the data in my worksheet were positive, but some of data shown on the matrix were negative values. I think there were something wrong during the conversion but I don¡¯t know what happened. I also tried the method of Random (Thin Plate Spline), but it said ¡°The method is not suitable for large dataset¡±. Another question is: for the color filled contour, is that possible to change the scale type of axis from linear to log? Thank you very much Dash [img]http://www.originlab.com/ftp/forum_and_kbase/Images/worksheet---.jpg[/img] [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.