Extracting data from a graph image using 'ginput'
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Hello,
I want to extract data using 'ginput' from an attached file.
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Vishal Gaur
2020-7-1
0 个投票
Hi Changho LEE,
Firstly, you have to digitize your graph. You can find many methods on File Exchange - https://www.mathworks.com/matlabcentral/fileexchange/?term=digitize&sort=ratings_desc
Then you can use ginput.
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Changho LEE
2020-7-1
Hi Vishal Gaur,
Thanks for the kind answer.
I picked a tool that looks very useful (graph_picker) and tried it myself, but finally I don't know how to extract the data.
If you know how to do it, I would appreciate it.
See attached file for larger image.
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darova
2020-7-2
here is an example
x = rand(100,1); % generate some data
y = rand(100,1);
plot(x,y,'.r')
p = ginput(1);
d = pdist2([x y],p); % find combination of distances
[~,ix] = min(d); % index of closest poont
line(x(ix),y(ix),'linestyle','none','marker','o')
text(x(ix), y(ix),sprintf('%0.1f %0.1f',x(ix), y(ix)))
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