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Interpolation: Method->"Spline"

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  • Subject: [mg98192] Interpolation: Method->"Spline"
  • From: dh <dh at>
  • Date: Thu, 2 Apr 2009 04:46:29 -0500 (EST)


does anybody know what sort of splines Wolfram choose to implement. One 

would assume that normal splines are the thing to do, but the second 

derivative is not zero at the ends as the following shows:

d = Table[RandomReal[{-1, 1}], {5}]

f = Interpolation[d, Method -> "Spline"];

Plot[f[x], {x, 1, Length[d]},

  Epilog -> Point[Transpose[{Range[Length[d]], d}]]]

Plot[f'[x], {x, 1, Length[d]}]

Plot[f''[x], {x, 1, Length[d]}]


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