All Forums  Origin Forum  Origin Forum  Boundary condition with Savitzky-Golay filter

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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 sqapple[/i] [br]Hi, The Smoothing dialog provides a drop-down list for defining the boundary condition, to pad the input data so that it have enough data points to calculate the output for the data points near the ends of the data. I learned the Savitzky-Golay algorithm and complete manual computation. To my surprise, the results are the same with the Origin results except for the data points near the ends of the data. When I pad zeros with the ends of data I could not get the same results with the Origin boundary condition "None". May I misunderstood the boundary condition of Origin? I need someone could tell me why. Here is my example: I pick the polynomial order 3, and the window size 2*m+1=7 (m=3), so the data after the fourth points are Ok. The data points are: 0.007589 0.007566 0.007596 0.007654 0.00774 0.007883 0.007915 My results of the first fourth data points: 0.0050476 0.0072169 0.0083197 0.0076635 the results from Origin: 0.00759383 0.00755821 0.00758893 0.00766348 Thanks a lot! Shenqian [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.