Retrieve the coordinates of the point from the graph

Question

Stanislav Kuba 2022-12-21

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1882732-retrieve-the-coordinates-of-the-point-from-the-graph

编辑： Bora Eryilmaz 2022-12-21

I have such a problem and can't see myself continuing.
I have been given such an assignment and at the end I can't continue on my own.
I have a graph and from the graph I have to read the coordinates of the point where 2 lines intersect and I have to save them in 
variables xm and ym. I would like to ask if someone could help me.
this is my work:
V1 = [-1 0 0 -2];
x = roots(V1);
  x1= x(1,1);
  x2= x(2,1);
  x3= x(3,1);
  R1=x1*2;
  R2=x3*x2;
  V2= poly([R1 R2]);
M1= [V1(1,1) V1(1,2) V1(1,3) V1(1,4) ; 1 2 3 4];
M2= [V2(1,1) V2(1,2);1 2;3 4;5 6];
M3 = M1.*M2';
max3=max(M3, [], 'all');
min3=min(M3, [],'all');
rozdiel=min3-max3;
if rozdiel<100
    min3=abs(min3);
    krok=floor(min3);
    A=linspace(min(M2(:,1)),max(M1(2,:)),krok);
    Acos=(cos(A)).^2;
    B=linspace(min(M1(2,:)),max(M2(:,1)),krok);
    Bsin=sin(B).^8;
    t=linspace(1,100,krok);
    figure
    hold on
    title('Graf uloha 9','FontSize',15,'Color','Blue')
    xlabel('cas \rightarrow')
    ylabel('hodnota \rightarrow')
    plot(Acos,t, 'color', 'Blue')
    plot(Bsin,t, 'color', 'Yellow')
end

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Answer 1

Bora Eryilmaz 2022-12-21

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1882732-retrieve-the-coordinates-of-the-point-from-the-graph#answer_1133702

编辑：Bora Eryilmaz 2022-12-21

If you want to do it manually on the plot by clicking with the mouse at or near the intersections, and get their coordinates, you can use the ginput command: https://www.mathworks.com/help/matlab/ref/ginput.html