Getting data from a Graph

Hello,

I'm currently studding a bubble colapse problem with Matlab. I got a graph but I want to know how can I get a Matrix or a Table (.txt or some similar type of file) with all the data from the graph. I mean, in the left will be the velocity and in the right the time correspondent to that velocity. I apologize if someone else has already asked this question but I didn't find a similar topic.

Thanks in advance.

[Image Analyst]

Is this similar http://www.mathworks.com/matlabcentral/answers/57636-digitize-extract-data-from-a-matlab-plot?

Answer 1

[Walter Roberson]

I will have to guess that it is a line plot. If so then,

h = findobj(gca, 'type', line);
x = get(h, 'xdata');
y = get(h, 'ydata');

After that,

fid = fopen('OutputFile.txt', 'wt');
fprintf(fid, '%g %g\n', [x(:), y(:)].' );
fclose(fid);

Answer 2

[Image Analyst]

Not sure if this is what you're looking for or not: http://www.mathworks.com/matlabcentral/fileexchange/36904-matlab-script-for-digitizing-a-published-graph