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Displaying information about the data set by clicking on its plot and then show a value that is associated with the (x,y) point

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Hello,
So, I have a GUI and I'll plot a figure in this GUI. Then I want the user to be able to click somewhere on the curve, and then the information about that point will show up. I followed what was said here: https://www.mathworks.com/matlabcentral/answers/11668-displaying-information-about-the-data-set-by-clicking-on-its-plot
But, also, I want, aside from showing the x and y coordinates, to show another information that's associated with each (x,y) point. Like a (x,y) point indicated the value of z. Is it possible?
For example:
x =
0.0960 0.2496 0.4032 0.5568 0.7104 0.8640
1 2 3 4 5 6
7 8 9 10 11 12
13 14 15 16 17 18
y =
0.0960 0.2496 0.4032 0.5568 0.7104 0.8640
19 20 21 22 23 24
25 26 27 28 29 30
31 32 33 34 35 36
fh = figure;
plot(x(2,:), y(2,:)); hold on;
plot(x(3,:), y(3,:)); hold on;
plot(x(4,:), y(4,:)); hold on;
datacursormode on
dcm = datacursormode(gcf);
set(dcm,'UpdateFcn',@myupdatefcn)
function txt = myupdatefcn(trash,event)
pos = get(event,'Position');
dts = get(event.Target,'Tag');
txt = {dts,...
['x: ',num2str(pos(1))],...
['y:', num2str(pos(2))]};
I want to show x(1, ?) and y(1, ?) when the user clicks on a point in the curve.
Thank you all

  2 Comments

Adam Danz
Adam Danz on 17 Jan 2020
Is the figure external to the GUI (I see you're producing a figure in your code).
If not, what kind of app are you building? AppDesigner? Guide? uicontrol?

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Accepted Answer

Matt J
Matt J on 17 Jan 2020
Edited: Matt J on 17 Jan 2020
....
set(dcm,'UpdateFcn',@(t,e) myupdatefcn(t,e,x,y) );
function txt = myupdatefcn(~,event,xdata,ydata)
pos = get(event,'Position');
dts = get(event.Target,'Tag');
[~,j]= find( xdata==pos(1) & ydata==pos(2) );
txt = {dts,...
['x: ',num2str(pos(1)),' x(1,?): ', num2str(xdata(1,j))],...
['y: ',num2str(pos(2)),' y(1,?): ', num2str(ydata(1,j))]};
end

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