ТУЗК1 / lr_3

Отчет

Лабораторная работа №3

Сабитов Илияс

ПБ-713

>> X=[0 0.5 1 1.5 2]

X =

0 0.5000 1.0000 1.5000 2.0000

>> Y=[1.1032 0.8754 0.7835 0.3201 0.1108]

Y =

1.1032 0.8754 0.7835 0.3201 0.1108

>> xzv=1.67

xzv =

1.6700

>> P1=polyfit(X(3:4),Y(3:4),1)

P1 =

-0.9268 1.7103

>> z1=polyval(P1,xzv)

z1 =

0.1625

>> P2=polyfit(X(2:4),Y(2:4),2)

P2 =

-0.7430 0.9307 0.5958

>> z2=polyval(P2,xzv)

z2 =

0.0779

>> P3=polyfit(X(2:5),Y(2:5),3)

P3 =

0.8341 -3.2454 3.2246 -0.0298

>> z3=polyval(P3,xzv)

z3 =

0.1891

>> xi1=X(3):0.05:X(4);

>> xi2=X(2):0.05:X(4);

>> xi3=X(2):0.05:X(5);

>> y1=polyval(P1,xi1);

>> y2=polyval(P2,xi2);

>> y3=polyval(P3,xi3);

>> plot(X,Y,'*k',xi1,y1,xi2,y2,xi3,y3);grid

>> P4=polyfit(X(1:5),Y(1:5),4)

P4 =

Columns 1 through 4

0.7553 -2.9425 3.3638 -1.4963

Column 5

1.1032

>> z4=polyval(P4,xzv)

z4 =

0.1559

>> eps1=abs(z1-z2)

eps1 =

0.0846

>> eps2=abs(z2-z3)

eps2 =

0.1112

>> eps3=abs(z3-z4)

eps3 =

0.0332