About natural cubic spline

[José Luis García Pallero]

Hello:

Reading the help text of spline() I can see that the computed spline
is the not-a-knot versión (continuous third derivatives at the second
and the penultimate points), but there is not an option to determine
the natural spline (second derivatives equal to zero at the first and
end points). This is the case in Octave and Matlab, but the last one
have the function csape() in the Curve Fitting toolbox which provides
the option to compute the natural spline.

Why spline() has not such an option in Octave? Is only for Matlab
compatibility? Has Octave other function to compute the natural
spline?

Thanks

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José Luis García Pallero
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