what does ppval means...????

2013 6 14
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While calculating the curvature a command ppval is used. What does it mean and what it does here...??
s=spline(x,y) s1=s; s1.order=s.order-1; s2=s1; s2.order=s1.order-1;
A1=ppval(s1,x); A2=ppval(s2,x);

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