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i am new to matlab and i want to learn, can anyone help me with this please!!!

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Anas Gharsa
Anas Gharsa 2022-1-22
评论： Anas Gharsa 2022-1-25
I want to write a script which produces the polynomial interpolating the function f(x) = sin(4x) at the points x0 = 1, x1 = 3, x2 = 3.5, x3 = 4.0 by using the Lagrange form of the interpolating polynomial!!!!!!
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Anas Gharsa
Anas Gharsa 2022-1-25
this is what i did
x= [0.9 1.5 2.4 2.6 2.8 3.1 3.5 3.8];
y= [1.0 0.8 1.3 6.2 9.3 6.0 2.1 -0.5];
plot(x,y,'ro');
hold on
p1 = polyfit(x,y,2);
coefficients = polyfit(x, y, 2);
yFit = polyval(coefficients, 2.5);
but it shows like this
why ??did i do something wrong ??

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KSSV
KSSV 2022-1-22

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