I would like to extract data points from a plot.
You can extract data points from a plot in MATLAB even if you don't have access to the original data. Here are the steps to do this:
Open the Figure: If the figure is saved as a .fig
file, use the openfig
function. If the figure is already open, use gcf
to get the current figure handle.
Access the Plot Data: Use the Children
property to access the axes and data objects.
Retrieve the Data: Extract the XData
and YData
properties from the data objects.
Here’s an example:
% Open the figure file (replace 'your_figure.fig' with your actual file name)
fig = openfig('your_figure.fig');
% Alternatively, if the figure is already open
% fig = gcf;
% Get the axes objects
axObjs = fig.Children;
% Get the data objects within the axes
dataObjs = axObjs.Children;
% Extract XData and YData from the first data object (assuming it's a Line object)
x = dataObjs(1).XData;
y = dataObjs(1).YData;
% Display the extracted data
disp('X Data:');
disp(x);
disp('Y Data:');
disp(y);
This code extracts the XData
and YData
from the first plotted line in the figure. If there are multiple lines or data objects, you can loop through dataObjs
to extract data from each one.
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