Работы / Лаб. работа №3

Отчет

Лабораторная работа №3

Сабитов Ильяс

ПБ – 713

x=[0 0.5 1 1.5 2];

>> y=[0.4899 1.4574 0.9310 0.7874 0.7693];

>> xzv=0.74

xzv =

0.7400

>> p1=polyfit(x(2:3),y(2:3),1)

p1 =

-1.0528 1.9838

>> z1=polyval(p1,xzv)

z1 =

1.2047

>> p2=polyfit(x(2:4),y(2:4),2)

p2 =

0.7656 -2.2012 2.3666

>> z2=polyval(p2,xzv)

z2 =

1.1570

>> p3=polyfit(x(2:5),y(2:5),3)

p3 =

-0.3431 1.7948 -3.1446 2.6239

>> z3=polyval(p3,xzv)

z3 =

1.1407

>> xi1=x(2):0.05:x(3);

>> 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

-1.4227 6.7703 -10.6535 5.7470

Column 5

0.4899

>> z4=polyval(p4,xzv)

z4 =

1.2257

>> eps1=abs(z1-z2)

eps1 =

0.0478

>> eps2=abs(z2-z3)

eps2 =

0.0163

>> eps3=abs(z3-z4)

eps3 =

0.0850