Extraction data from several implicit plots

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Yuriy Yerin 2022-3-2

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1661950-extraction-data-from-several-implicit-plots

编辑： Yuriy Yerin 2022-3-2

Hello everybody.

I'd like to extract data from the figure of two plots of implicit functions in the form of txt file according to the code below

function z=data_test
f1=@(x,y) 4*x.^3+10*y.^2-x-3;
f2=@(x,y) x.^2-y.^2-1;
fimplicit(f1,[-4 4 -3 3],'MeshDensity',100)
hold on
fimplicit(f2,[-4 4 -3 3],'MeshDensity',100)
fig=gcf;
data_x=findobj(fig,'-property','XData');
x1=data_x(1).XData;
data_y=findobj(fig,'-property','YData');
y1=data_y(1).YData;
A = [x1; y1];
fileID = fopen('data_test1.txt','w');
fprintf(fileID,'%10.8f %15.17f\n',A);
fclose(fileID);
end

However, the goal is to produce a file with three columns, where the first column corresponds to x, while two others are for values of y for functions f1 and f2. Is it possible to create a file with such a structure?

I appreciate for any help and suggestions.