4 курс_1 / Мат.мод 313 / Лаб4

1.

x=[0.0000 0.5000 1.0000 1.5000 2.0000];

y=[0.0087 1.0062 1.1498 1.0062 0.7881];

>> coef1=polyfit(x,y,1)

coefl =

0.3118 0.4800

>> coef2=polyfit(x,y,2)

coef2 =

-0.7767 1.8651 0.0917

coef3=polyfit(x,y,3)

coef3 =

0.5196 -2.3355 2.9823 0.0138

>> xi=min(x):0.1:max(x);

>> g1=polyval(coef1,xi);

>> g2=polyval(coef2,xi);

g3=polyval(coef3,xi);

>> plot(x,y,'*k',xi,g1,xi,g2);grid

2.

3. >> G1=polyval(coef1,x);

>> G2=polyval(coef2,x);

>> G3=polyval(coef3,x);

delt1 =

0.5904

>> delt2=mean(sum((y-G2).^2))

delt2 =

0.0625

>> delt3=mean(sum((y-G3).^2))

delt3 =

0.0018

>> delt1=sum((y-G1).^2)

delt1 =

0.5904

>> delt2=sum((y-G2).^2)

delt2 =

0.0625

>> delt3=sum((y-G3).^2)

delt3 =

0.0018