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Cumulative Cubic Integration

by Roger Stafford

 

11 Mar 2008 (Updated 11 Mar 2008)

No BSD License  

Similar to cumtrapz but third order accuracy. Unequal x spacing allowed.

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z = cumint3(x,y) approximates the integrals from x1 to x2 of a cubic polynomial through points (x0,y0), (x1,y1), (x2,y2), (x3,y3) for sliding four-point sets, and produces z as the cumulative values of these in a manner similar to cumtrapz. End intervals use cubics with two other points to the same side. Unequal intervals in x values are allowed. x, y, and z are column vectors of the same length which can be any amount not less than four.

MATLAB release MATLAB 5.2 (R10)
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integration Roger Stafford 22 Oct 2008 09:52:54
integration cumulative cubic Roger Stafford 22 Oct 2008 09:52:54
third order Roger Stafford 22 Oct 2008 09:52:54
cumtrapz Roger Stafford 22 Oct 2008 09:52:54
polynomial Roger Stafford 22 Oct 2008 09:52:54
 

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