Combined derivative and smoothing Central difference First Derivatives: First Derivative with one 3-point triangular smooth -0.25 -0.5 0 0.5 0.25 First Derivative with one 5-point triangular smooth -0.1111111111 -0.2222222222 -0.2222222222 0 0.2222222222 0.2222222222 0.1111111111 First Derivative with one 7-point triangular smooth -0.0625 -0.125 -0.125 -0.125 0 0.125 0.125 0.125 0.0625 First Derivative with one 9-point triangular smooth -0.04 -0.08 -0.08 -0.08 -0.08 0 0.08 0.08 0.08 0.08 0.04 First Derivative with one 11-point triangular smooth -0.0277777778 -0.0555555556 -0.0555555556 -0.0555555556 -0.0555555556 -0.0555555556 0 0.0555555556 0.0555555556 0.0555555556 0.0555555556 0.0555555556 0.0277777778 First Derivative with one 13-point triangular smooth -0.0204081633 -0.0408163265 -0.0408163265 -0.0408163265 -0.0408163265 -0.0408163265 -0.0408163265 0 0.0408163265 0.0408163265 0.0408163265 0.0408163265 0.0408163265 0.0408163265 0.0204081633 First Derivative with one 15-point Gaussian smooth 1 4 9 16 21 20 13 0 -13 -20 -21 -16 -9 -4 -1 First Derivative with two 3-point triangular smooths -0.0625 -0.25 -0.3125 0 0.3125 0.25 0.0625 First Derivative with two 5-point triangular smooths -0.012345679 -0.049382716 -0.1111111111 -0.1481481481 -0.1111111111 0 0.1111111111 0.1481481481 0.1111111111 0.049382716 0.012345679 First Derivative with two 7-point triangular smooths -0.00390625 -0.015625 -0.03515625 -0.0625 -0.08203125 -0.078125 -0.05078125 0 0.05078125 0.078125 0.08203125 0.0625 0.03515625 0.015625 0.00390625 ------------------------------------------ Second Derivatives: Second Derivative with two 7-point triangular smooths 0.00390625 0.0078125 0.01171875 0.015625 0.00390625 -0.0078125 -0.01953125 -0.03125 -0.01953125 -0.0078125 0.00390625 0.015625 0.01171875 0.0078125 0.00390625 Second Derivative with two 9-point triangular smooths = 19 coefficients 0.0016 0.0032 0.0048 0.0064 0.008 0.0032 -0.0016 -0.0064 -0.0112 -0.016 -0.0112 -0.0064 -0.0016 0.0032 0.008 0.0064 0.0048 0.0032 0.0016 Second Derivative with a 15-point Gaussian smooth 1 4 10 14 11 -4 -21 -30 -21 -4 11 14 10 4 1 ----------------------------------------- Central-difference Third Derivative with 17-point Gaussian smooth 1 4 9 10 1 -18 -32 -26 0 26 32 18 -1 -10 -9 -4 -1 ------------------------------------------- Fourth Derivative with 17-point Triangular smooth 1 2 3 -2 -7 -12 -2 8 18 8 -2 -12 -7 -2 3 2 1