Plot doesn't show anything

Question

Duc Anh Le 2019-12-8

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/495567-plot-doesn-t-show-anything

回答： Star Strider 2019-12-8

I'm trying to plot the orbit diagram of the logistic map, but the plot doesn't show anything. There are no error messages, so I'm stuck...

close;
clear;
orbit=zeros(1,300);
j=0;
% parameter range
for(r=2.8:0.001:4)
    j=j+1;
    % random nitiation of iteration
    xn1=rand(1);
        for(i=1:600)
        % calculate logistic map
        xn=xn1;
        xn1=r*xn*(1-xn);
       % wait for transients
       if(i>300)
           % store the orbit points
           orbit(i-300)=xn1;
       end
    end
    plot(r,orbit);
    if(j==1)
        axis([2.8 4 0 1]);
    hold;
    end
    end

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Answer 1

Star Strider 2019-12-8

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/495567-plot-doesn-t-show-anything#answer_405436

在 MATLAB Online 中打开

Try this slight edit of your code:

orbit=zeros(1,300);
j=0;
% parameter range
rv=2.8:0.001:4;
for k = 1:numel(rv)
    r = rv(k);
    j=j+1;
    % random nitiation of iteration
    xn1=rand(1);
    for i=1:600
        % calculate logistic map
        xn=xn1;
        xn1=r*xn*(1-xn);
        % wait for transients
        if(i>300)
            % store the orbit points
            orbit(i-300,k)=xn1;
        end
    end
%     plot(r,orbit,'.');
    if(j==1)
        axis([2.8 4 0 1]);
        hold;
    end
end
figure
plot(rv, orbit, '.');
axis([2.8 4 0 1]);