Get a point from a graph

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Ean Soo 2011-2-15

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https://ww2.mathworks.cn/matlabcentral/answers/1353-get-a-point-from-a-graph

评论： Nasiru Umar Bagudu 2022-2-5

Hie guys, I have done a GUI to plot a graph. Now i would like to get the calue from the graph. Lets say i plot(x,y). I would like to get the value out, for example when x=4, what is the value of y. I know there is a datacursormode, but it only show me the value in the graph. In this case, i would like to get the value in the command window.

Thanks Ean

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采纳的回答

Paulo Silva 2011-2-15

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https://ww2.mathworks.cn/matlabcentral/answers/1353-get-a-point-from-a-graph#answer_1974

在 MATLAB Online 中打开

You can retrieve the plotted data, for example:

XData=get(get(gca,'children'),'XData');
YData=get(get(gca,'children'),'YData');

Now if you want to know the y value when x=4 just do

YData(XData==4)

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Ean Soo 2011-2-16

Thank You, your code help me a lot.

Nasiru Umar Bagudu 2022-2-5

What if i want to get the value of x when y is zero for example?

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Walter Roberson 2011-2-15

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https://ww2.mathworks.cn/matlabcentral/answers/1353-get-a-point-from-a-graph#answer_1978

You can use a custom datacursormode callback that includes display() in its code.

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Ean Soo 2011-2-16

Erm, is not suitable for me in this case because i would want to recall a very precise value like 12.22. I still working on how to recall that thing. Is just didnt work..

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