ЧМ (МП-3) / Лабы / Лабы 2003, Земсков / LAB2

Лабораторная работа №2

x=[-2:1:2]

y=sin(x)

lagr(1.7,x,y)

ans=1.062

t=[-2:0.1:2]

1) plot(t,lag(t,x,y)-sin(t))

2) x= [-2, -1.1756, 0, 1.1756, 2]

y=sin(x)

plot(t,lag(t,x,y)-sin(t))

3) i=[0:1:5]

x=-2+4.*i/6

x = -2.0000 -1.3333 -0.6667 0 0.6667 1.3333

>> y=sin(x)

y = -0.9093 -0.9719 -0.6184 0 0.6184 0.9719

>> t=[-2:0.1:2]

>> plot(t,lag(t,x,y)- sin(t))

4) i=[0:1:8]

i = 0 1 2 3 4 5 6 7 8

>> x=-2+4.*i/9

x = -2.0000 -1.5556 -1.1111 -0.6667 -0.2222 0.2222 0.6667 1.1111 1.5556

>> y=sin(x)

y = -0.9093 -0.9999 -0.8962 -0.6184 -0.2204 0.2204 0.6184 0.8962 0.9999

>> plot(t,lag(t,x,y)-sin(t))

5) i = 0 1 2 3 4 5

>> x = [4.*cos((2*i+1).*3.14/(12)) ]/2

>> x= -1.9319 -1.4148 -0.5189 0.5158 1.4125 1.9311

>> y=sin(x)

y = -0.9355 -0.9879 -0.4959 0.4933 0.9875 0.9358

>> plot(t,lag(t,x,y)-sin(t))

6) i = 0 1 2 3 4 5 6 7 8

>> x = [4.*cos((2.*i+1).*3.14/18) ]/2

x = -1.9696 -1.7323 -1.2863 -0.6852 -0.0016 0.6822 1.2838 1.7307 1.9691

>> y=sin(x)

y = -0.9215 -0.9870 -0.9598 -0.6328 -0.0016 0.6305 0.9591 0.9872 0.9217

>> plot(t,lag(t,x,y)-sin(t))