plot command is not work in Gauss Seidel Method

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suketu vaidya
suketu vaidya 2020-12-4
回答： suketu vaidya 2020-12-4
A = [
1 0 -1 0 0 0 0
-1 1 1 0 0 0 0
0 -1 2 -1 0 0 0
0 -1 0 2 0 1 0
0 -1 -1 0 2 1 1
0 0 1 -1 0 2 -1
0 0 0 -1 1 -1 2
];
b = [0 0 0 0 0 20 0]';
x=[1 1 1 1 1 1 1];
n=size(x,1);
normVal=Inf;
tol=1e-5; itr=0;
%%Gauss Seidel Method
while normVal>tol
x_old=x;
for i=1:n
sigma=0;
for j=1:i-1
sigma=sigma+A(i,j)*x(j);
end
for j=i+1:n
sigma=sigma+A(i,j)*x_old(j);
end
x(i)=(1/A(i,i))*(b(i)-sigma);
end
itr=itr+1;
normVal=norm(x_old-x);
end
%%
fprintf('system solution : \n%f\n%f\n%f\n%f in %d iterations',x,itr);
hold on
plot(itr,x, '+')
xlim([0 10])
ylim([0 2])
hold off
end

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采纳的回答

John D'Errico
John D'Errico 2020-12-4
When you tell us that something does not work, you need ot explain why you THINK it does not work. In fact, plot worked perfectly well there. At least, it tiried to work as well as it could.
itr
itr =
2
x
x =
0 1 1 1 1 1 1
plot(itr,x, '+')
So itr is the number 2. x is a vector. What did you expect it to do?
  2 个评论
suketu vaidya
suketu vaidya 2020-12-4
hello ,
i is not shosws full vactor x . i means x1 = 0 x2 = 1 x3=1 and so on . i want a graph that shows x1,x2,x3 in x axist and on y axis value of x1,x2,x3 and so on

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更多回答（1 个）

suketu vaidya
suketu vaidya 2020-12-4
right ans is
hold on
plot(x,'o')

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