Extracting data from a graph image using 'ginput'
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Changho LEE
am 30 Jun. 2020
Kommentiert: Changho LEE
am 3 Jul. 2020
Hello,
I want to extract data using 'ginput' from an attached file.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/324469/image.jpeg)
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Vishal Gaur
am 1 Jul. 2020
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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darova
am 2 Jul. 2020
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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