MATLAB: Extracting data from a graph image using ‘ginput’

ginputMATLAB

Hello,

I want to extract data using 'ginput' from an attached file.

Best Answer

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.

Related Solutions

MATLAB: I generate a 3D graph ,and i wants to get back points(x,y,z) from the graph ,selectively using the cursor.And i use ‘ginput’ it take data from the graph even if i pick at the white space of the graph.And i need to write a script to generate a vecto

Hi Bharath,

If you want to get the 3D coordinates of the point where the mouse is clicked, you can make use of the CurrentPoint property of the current axes object to get the 3D coordinates of the current location of the mouse as follows:

>> get(gca, 'CurrentPoint')

For more information about the property, kindly have a look at the 'CurrentPoint' documentation here.

Hope this helps.

Regards,

Alok

MATLAB: Obtain data points from plot using ‘buttondownfcn’ nested functions

Here is an example

function main
x = rand(100,1);                       % generate random data
y = rand(100,1);
h = plot(x,y,'.r');                    % plot data
set([h gcf],'hittest','off')           % turn off hittest 
set(gca,'buttondownfcn',@func)         % assign function to gca
    function func(hobj,~)
        p  = get(hobj,'currentpoint'); % get coordinates of click
        d = pdist2([x y],p([1 3]));    % find combination of distances
        [~,ix] = min(d);               % find smallest distance
        line(x(ix),y(ix),'linestyle','none','marker','o')
        [x(ix),y(ix)]
    end
end

Best Answer

Related Solutions

MATLAB: I generate a 3D graph ,and i wants to get back points(x,y,z) from the graph ,selectively using the cursor.And i use ‘ginput’ it take data from the graph even if i pick at the white space of the graph.And i need to write a script to generate a vecto

MATLAB: Obtain data points from plot using ‘buttondownfcn’ nested functions

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