POLYFIT 

x = linspace(0,4*pi,10);
y = sin(x);
Use polyfit to fit a 7th-degree polynomial to the points.
p = polyfit(x,y,7);
Evaluate the polynomial on a finer grid and plot the results.
x1 = linspace(0,4*pi);
y1 = polyval(p,x1);
figure
plot(x,y,'o')
hold on
plot(x1,y1)
hold off

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