How do I extract data points from a plot? (2024)

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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 . 2024-04-17 01:12:07

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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How do I extract data points from a plot? (2024)

Mariahernandez01 asked . 2020-04-03