Extracting data from a .fig file

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

Answer 1

[Dyuman Joshi]

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

[Wissem-Eddine KHATLA]

Thank you : I misunderstood the result of the get function. Thanks again

[Dyuman Joshi]

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