2 sets of x,y variables, one changing loop, one set, how to plot them and update plot to have both

Question

SETH GERSBACH 2022-4-17

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1698600-2-sets-of-x-y-variables-one-changing-loop-one-set-how-to-plot-them-and-update-plot-to-have-both

评论： SETH GERSBACH 2022-4-18

I have wrighting a program and want to plot two variables on a graph

The problem is that I know how to update the graph, but I don't know how to update the graph with both values where mass_c is unchanged and mass_o is changed

mass_c [0,0]

%mass centre

mass_o[x,y]

%mass_orbit

graph mass_c and mass_o

while

change mass_o position

set(h, 'XData', mass_o(1), 'YData', mass_o(2) P(2) );

drawnow;

end

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Answer 1

Voss 2022-4-18

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1698600-2-sets-of-x-y-variables-one-changing-loop-one-set-how-to-plot-them-and-update-plot-to-have-both#answer_944980

在 MATLAB Online 中打开

Setting the XData and YData of the line that should change is perfectly good way to update what needs updating (and avoid updating what doesn't).

mass_c = [0,0];
%mass centre
mass_o = [5,5];
%mass_orbit 
line('XData',mass_c(1),'YData',mass_c(2),'Color','k','Marker','o');
h = line('XData',mass_o(1),'YData',mass_o(2),'Color','r','Marker','x');
% graph mass_c and mass_o
i = 1;
while i < 100
    mass_o = [5*cos(pi/4+i*pi/50) 5*sin(pi/4+i*pi/50)]
    set(h, 'XData', mass_o(1), 'YData', mass_o(2));% P(2) );
    % change mass_o position
    drawnow;
    i = i+1;
end

Is there a problem you run into when you try to do that?

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SETH GERSBACH 2022-4-18

Thank you for your assistance, it does infact work, but I found that starting the plot outside the loop and then having the same plot in the graph, just update the plot.

However your solution is better and more permint then my filler code

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