Selecting a point on a scatter plot, saving index of point

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James Morris
James Morris 2019-8-17
评论： darova 2019-8-18
What is the best way to allow a user to select 5 data points on a scatter plot and then save the index of these plots?
Code I am currently using:
disp('Following the trajectory from <start> to <end>, please click 5 points on the plot where you think the keypress moments are, press Enter to confirm');
% Save points selected on plot by user
[user_selected_keypressframes] = ginput;
% Extract coordinates for each user selected point and save
[uskf1] = user_selected_keypressframes(1,:);
[uskf2] = user_selected_keypressframes(2,:);
[uskf3] = user_selected_keypressframes(3,:);
[uskf4] = user_selected_keypressframes(4,:);
[uskf5] = user_selected_keypressframes(5,:);
Issue:
This code allows the user to click/select any area within the plot, I want them to only be able to click/select data points so I can save the index of these points.

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采纳的回答

darova
darova 2019-8-17
You can use pdist2() and min() functions to select closest to your data points
clc,clear
x = linspace(0,10,20)';
y = sin(x);
plot(x,y,'.-b')
g = ginput(3); % pick 3 points
D = pdist2([x y],g);
[~,ix] = min(D); % indices
hold on
plot(x(ix),y(ix),'or')
hold off

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