求解一个多项式绘图订正。

求解如何修正

Answer 1

[mdpexbn]

你这含有未知数x，也不给值，当然没有数值了

clear all

x1 = [0.2 0.4 0.6 0.8 1.0];

y1 = [0.98 0.92 0.81 0.64 0.38];

n = length(y1);

c = y1;

for j = 2 : n

for i = n:-1:j

c(i)=(c(i)-c(i-1))/(x1(i)-x1(i-j+1));

end

end

x = 1;

df(1)=1;

d(1)=y1(1)*df(1);

for i =2:n

df(i) = df(i-1)*(x-x1(i-1));

d(i)=c(i)*(df(i));

end

p4 = vpa(d,5)

plot(x1,double(p4))