How to get the coordinate value on the Matlab script for further coding from the previous graph?

How to get the select/label two nodes from graph to be source and target?And transfer the node information(position value/coordinates) on the editor for more coding later?

[Geoff Hayes]

Sneha - please clarify what you mean by How to get the select/label two nodes from graph to be source and target. Do you want to be able to click on two nodes, the first being the source and the second the target? And you want to store these values somewhere? I'm not sure what you mean by on the editor unless you want this information to be displayed in the workspace. Is the above axes in a GUI or is it just drawn from the command line?

[Geoff Hayes]

Oh - and is this homework since it relates back to https://www.mathworks.com/matlabcentral/answers/330552-how-to-plot-random-x-y-coordinates-on-a-plot-if-x-and-y-has-different-values-in-array-form-and-j?

Answer 1

[Alain Kuchta]

My understanding is that you would like to select points in a figure (in this case a plot of a graph) and retrieve the values of the selected points programmatically. I am assuming that the points you want to select are on one of the lines of your graph or a vertex of the graph.

1) Use Data Brushing to select points. For more information about data brushing, refer to the following link:

https://www.mathworks.com/help/matlab/data_analysis/marking-up-graphs-with-data-brushing.html

The brush command also can be used to start Data Brushing programmatically. For more information, refer to the following link:

https://www.mathworks.com/help/matlab/ref/brush.html

2) Acquire the brushed points programmatically:

p = plot(x,y);
% do data brushing manually
bd = logical(get(p, 'BrushData'));
brushed_x = p.XData(bd);
brushed_y = p.YData(bd);

See also this MATLAB Answers question:

https://www.mathworks.com/matlabcentral/answers/25597-how-can-i-save-the-brushed-data-to-a-variable#comment_317706

[Sneha Kolapalli]

I need to get the coordinate values the Matlab script file.

Answer 2

[Sneha Kolapalli]

[xp,yp] = ginput(2)

It will returns the 2 values of x, and 2 values of y for the two points you click on the figure. If the number in ginput is changed to 'n', 'n' points can be selected.