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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 agillinois[/i] [br]Help subtracting reference data! I need to plot delta-rho, or the difference in rho for different samples from a reference sample. I tried to just plot and then subtract the reference data, but it does this by INDEX not by temperature value. Since the temperature recordings for the various samples do not start/end at the same place nor change at the same rate, I can't just use subtract_ref. Is there anything I can do to "line up" different temperatures or take the average between two temperatures that are within certain values of each other? Help! Thanks [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.