Mariahernandez01 asked . 2020-04-03

How do I extract data points from a plot?

I would like to extract data points from a plot.

Matlab, Plot

Expert Answer

Prashant Kumar answered . 2024-05-08 22:52:51

In order to retrieve data values from a plot follow these steps:
1. Open the figure
2. In the MATLAB Command Window type the following commands:
 
h = findobj(gca,'Type','line')
x=get(h,'Xdata')
y=get(h,'Ydata')

Note that the dot notion feature is available starting from MATLAB 2014b, so instead of using the "get" function, you may do the following
x = h.Xdata;
y = h.Ydata;
In this example the plot was a plot of a line. The FINDOBJ function locates graphics objects with specific properties, for more information on this command type:
 
web([docroot,'/techdoc/ref/findobj.html'])

at the MATLAB Command Window.
If you have more than one line on the plot, the GET function will return a cell array. To retrieve the numbers inside of this cell array, use indexing. For example, to retrieve the points in the first line,
 
>> x{1}
>> y{1}

Or, if the lines have the same number of points, use the CELL2MAT function. Following the example above, to retrieve the numbers inside of cell array 'x' use:

X2=cell2mat(x)


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