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ppinterp( x, y, xi ) PPINTERP 1-D piecewise parabolic interpolation/extrapolation of
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Piecewise parabolic interpolation

05 Nov 2007 (Updated 30 Nov 2007)

Code to interpolate function values and corresponding derivatives.

File Information
Description	Piecewise parabolic interpolation and approximated calculation of first and second derivative at the interpolation point.
MATLAB release	MATLAB 5.2 (R10)

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Everyone's Tags	approximation, calculation, derivatives, interpolation, parabolic, point
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Updates

14 Nov 2007

1) Preliminary allocation of output data;
2) vectorization (for loop removed).

20 Nov 2007

Included:
1) help;
2) error checking.

Removed potential overflow due to repmat usage.

Output vectors match size of input vector.

30 Nov 2007

Uses bracketting points instead of closest points.