Iteration output won't show in a plot

Question

Mean der 2020-10-15

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/614593-iteration-output-won-t-show-in-a-plot

评论： Sudhakar Shinde 2020-10-15

Hello. I created a for loop that will give the approximated values of a square root. My problem is whenever i try to plot the output values, it just simply show an empty graph. Here is my code:

format long;
disp('Number of Iterations            Approximate Value')
xData=1;
n=1;
fprintf('\n%d                                  %.12f. \n\n',1,xData)
for n=2:5
    x=0.5*(xData+2/xData);
    xData=x;
    fprintf('\n%d                                  %.12f. \n\n',n,xData)
end
figure
plot(1:1:10,xData)

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Answer 1

Sudhakar Shinde 2020-10-15

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/614593-iteration-output-won-t-show-in-a-plot#answer_514458

在 MATLAB Online 中打开

Try this:

format long;
disp('Number of Iterations            Approximate Value')
xData=1;
n=1;
fprintf('\n%d                                  %.12f. \n\n',1,xData)
for n=2:5
    x=0.5*(xData(n-1)+2/xData(n-1));
    xData(n)=x;
    fprintf('\n%d                                  %.12f. \n\n',n,xData)
end
figure
plot(1:1:5,xData)