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why is my plot not showing?

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Luis Garcia
Luis Garcia 2018-2-13
评论： Luis Garcia 2018-2-13
Im trying to plot iteration on the x-axis vs error_delta on the y-axis, but nothing shows, they are inside the while loop.
%root for f(x) = cos(x)
paso = 0.5e-10;
N = 100;
x= 1.0; %initial guess.
i = 0;
eps = 1;
root_delta = 4.6;
figure(1);
hold on;
while eps >= paso && i <= N
y = x - (cos(x)/(-sin(x)));
eps = abs(y-x);
x= y;
error_delta = abs(root_delta - x);
i = i+1;
disp(' root iteration');
disp([x',i',error_delta']);
semilogy(i,error_delta);
xlabel('iterations');
ylabel('error Delta');
end
disp(y);
disp(i);

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采纳的回答

Walter Roberson
Walter Roberson 2018-2-13
i = i+1;
error_delta(i) = abs(root_delta - x);
semilogy(1:i,error_delta);
drawnow()

更多回答（1 个）

Image Analyst
Image Analyst 2018-2-13
You need to index x and y. You're just overwriting the same scalar values so there is never an array to plot.
  1 个评论
Luis Garcia
Luis Garcia 2018-2-13
so error_delta = 0; but x is the i(for this plot), and I taught i was index at 0 already.

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