Selecting the nearest data point in a 2-D plot

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Sanjoy Jena
Sanjoy Jena 2019-4-11
编辑： Ajay Kumar 2019-11-5
Hi,
Is it possible to select the nearest data point rather select any point on the graph? I have seen "ginput" and "getpts" function. Both of these select the point that we click not the nearest data point.
For example you can view thw bottom code
x = 0:0.1:10;
for C=1:3
za = C;
y = (x.^za);
hg = figure(1);
plot(x,y);hold on;
[xda(:,C),yda(:,C)] = ginput(2);
%[xda(:,C),yda(:,C)] = getpts(hg);
display(za);
end

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回答（1 个）

Ajay Kumar
Ajay Kumar 2019-11-5
编辑：Ajay Kumar 2019-11-5
Try to perform difference (and take minimum of absolute) between both ginput data point and original data and take out the index.
[val,idx]=min(abs(ginput_data - original_data));
then use this idx to go to the original data (which is the nearest point) instead of any point on axes.
  2 个评论
darova
darova 2019-11-5
Using difference you just find min(dx) and min(dy). Use minimum distance instead (e.g. pdist2)
Ajay Kumar
Ajay Kumar 2019-11-5
编辑：Ajay Kumar 2019-11-5
Also, a small addition to darova's comment. pdist2 needs Statistcs and machine learning toolbox.

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