Extracting data from a .fig file

2023 11 23
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更新时间：2023 11 23
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Hello everyone,
I know this has already been discussed in an another discussion but I want to extract data from a particular figures and I keep having an error while using the habitual procedure :
open('Comparaison R(t) EXP x THE.fig');
a = get(gca,'Children');
xdata = get(a, 'XData');
ydata = get(a, 'YData');
zdata = get(a, 'ZData');
I obtain the following error :
Error using matlab.graphics.primitive.Data/get
Unrecognized property XData for class ConstantLine.
Anyone knows how I can have access to these datas ?
Thanks for your help in advance,
Sincerely

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Dyuman Joshi
Dyuman Joshi 2023-11-23
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Ran in:
There are multiple objects in the figure. You need to choose the object(s) for which you want to get the data -
open('Comparaison R(t) EXP x THE.fig')
a = get(gca,'Children')
a =
3×1 graphics array: ConstantLine (L_{car}) Line (Q_{t} - Elastique) Line (Exp)
%x, y and z data for the 2nd graphics object
x2 = a(2).XData
x = 1×255
0 0.2000 0.4000 0.6000 0.8000 1.0000 1.2000 1.4000 1.6000 1.8000 2.0000 2.2000 2.4000 2.6000 2.8000 3.0000 3.2000 3.4000 3.6000 3.8000 4.0000 4.2000 4.4000 4.6000 4.8000 5.0000 5.2000 5.4000 5.6000 5.8000
y2 = a(2).YData
y = 1×255
0 0.0010 0.0012 0.0014 0.0016 0.0017 0.0018 0.0019 0.0020 0.0021 0.0021 0.0022 0.0023 0.0023 0.0024 0.0024 0.0025 0.0025 0.0026 0.0026 0.0027 0.0027 0.0028 0.0028 0.0029 0.0029 0.0029 0.0030 0.0030 0.0030
z2 = a(2).ZData
z = 1×0 empty double row vector

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Wissem
Wissem 2023-11-23
Thank you : I misunderstood the result of the get function. Thanks again
Dyuman Joshi
Dyuman Joshi 2023-11-23
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Ran in:
You're welcome!
Also, note that not every graphical object will have coordinate data associated with it.
A ConstantLine object is an example of that -
open('Comparaison R(t) EXP x THE.fig')
a = get(gca,'Children')
a =
3×1 graphics array: ConstantLine (L_{car}) Line (Q_{t} - Elastique) Line (Exp)
get(a(1))
Alpha: 0.7000 Annotation: [1×1 matlab.graphics.eventdata.Annotation] BeingDeleted: off BusyAction: 'queue' ButtonDownFcn: '' Children: [1×1 ListOfPointsHighlight] Color: [1 0 0] ColorMode: 'manual' ContextMenu: [0×0 GraphicsPlaceholder] CreateFcn: '' DeleteFcn: '' DisplayName: 'L_{car}' FontAngle: 'normal' FontName: 'Helvetica' FontSize: 10 FontWeight: 'normal' HandleVisibility: 'on' HitTest: on InterceptAxis: 'y' Interpreter: 'tex' Interruptible: on Label: {'L_{car}'} LabelHorizontalAlignment: 'right' LabelOrientation: 'aligned' LabelVerticalAlignment: 'top' LineStyle: '-.' LineStyleMode: 'manual' LineWidth: 2 Parent: [1×1 Axes] PickableParts: 'visible' Selected: off SelectionHighlight: on SeriesIndex: 'none' Tag: '' Type: 'constantline' UserData: [] Value: 0.0082 Visible: on
%Though Get the axis and value associated with it
a(1).InterceptAxis
ans = 'y'
a(1).Value
ans = 0.0082

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