怎么用matlab求complete cubic spline interpolation

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怎么用matlab求complete cubic spline interpolation
I need help,I want to construct complete cubic spline interpolations for the data set below.
Date:
X=[-2.0,-1.5,-1,-0.5,0.0,0.5,1.0,1.5,2.0];
Y=[0,0,0,0.87,1,0.87,0,0,0];
Graph the data points and the interpolations on a single plot.
This is my project.I have no idea to use Matlab to do it.Please help me.Thank you everyone.

(1)the program code
X=[-2.0,-1.5,-1,-0.5,0.0,0.5,1.0,1.5,2.0];
Y=[0,0,0,0.87,1,0.87,0,0,0];
plot(X,Y,'r*')
hold on
Xx=-2.0:0.05:2.0;
Yy=spline(X,Y,Xx);
plot(Xx,Yy,'k')
xlabel('X');ylabel('Y');
legend('The raw data','The interpolation curve')
(2)the figure

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