How do I extract data from MATLAB figures? (some error)

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jaejin kim
jaejin kim 2020-10-7
评论： Ameer Hamza 2020-10-7
I want to extract 'y data' value from a fig file.
I input the following code in Matlab R2018b:
ezplot('y*(0.6326*log(y)+4.419*y + 30.48) - 80*sin(x)^2',[-5 5 -1 4])
>> h= gcf;
axObjs = h.Children
dataObjs = axObjs.Children
x = dataObjs(1).XData
y = dataObjs(1).YData
but I get the value for 'x axis' and 'y axis'. I don't need y axis. I only want to get the value of y date.
No matter what i do i can't make this to work. It's very strange. Any help will be greatly appreciated. Thanks in advance.

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Ameer Hamza
Ameer Hamza 2020-10-7
编辑：Ameer Hamza 2020-10-7
ezplot() is being depreciated. Also, it generates a contour object, which is not so helpful to extract the data. Use fimplicit instead.
f = fimplicit(@(x, y) y.*(0.6326*log(y)+4.419*y + 30.48) - 80*sin(x).^2, [-5 5 -1 4]);
h= gcf;
axObjs = h.Children;
dataObjs = axObjs.Children;
x = dataObjs(1).XData;
y = dataObjs(1).YData;
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