MATLAB: How to extract data from 2D graph

extract data

Hi,

I got 2D graph like attacment. how to extract the data from .jpg? i do convert it in .fig but i have error:

"No appropriate method, property, or field 'ZData' for class 'matlab.graphics.primitive.Image'.

Error in test123 (line 12)

z = dataObjs(1).ZData"

Thanks

Best Answer

See this file exchange: https://in.mathworks.com/matlabcentral/fileexchange/7173-grabit

If you have .fig,,,you can get the handles of the figure and the handles have XData and YData.

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MATLAB: How to obtain data in a matrix from fig.file

The ‘Children’ propertiy disappeared with the introduction of ‘HG2’ (handle graphics version 2) in R2014b.

You most likely need to use the findobj (link) function.

Example —

figure
surf(rand(10))
h = gca;
srf = findobj(h,'Type','Surface');
X = srf.XData;
Y = srf.YData;
Z = srf.ZData;

That should return all the data you want. To see all the fields in the ‘srf’ structure, use:

sp = get(srf)

to display them.

MATLAB: How to adjust the labels on contour lines in a ‘meshc’ 3D-plot

Hey Ibrahim,

have a look at Contour Properties - the LabelSpacing property might help. Also you can specify your own contour levels (see the Contour Levels property group) which might be used to control the labels indirectly.

Greetings, David

Best Answer

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MATLAB: How to obtain data in a matrix from fig.file

MATLAB: How to adjust the labels on contour lines in a ‘meshc’ 3D-plot

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