How to fix the "Improper index matrix reference" error in my Data Extraction coding?

I am trying to extract data from the MATLAB figure named "NF power_Aulayers_etch_glass-by-glass_xz" as attached. But, when I run the code, it doesn't extract the data, rather it shows "Improper index matrix reference" this message. So, how do I resolve the error and extract data from the figure?

//

fig = openfig('NF power_Aulayers_etch_glass-by-glass_xz.fig');

Extracted_data = findobj(fig,'-property','XData','-property','YData','-property','Zdata');

x = Extracted_data(1).XData;

y = Extracted_data(1).YData;

z = Extracted_data(1).ZData;

//

Answer 1

[dpb]

hF=openfig('NF power_Aulayers_etch_glass-by-glass_xz.fig');
hAx=hF.Children;        % the axes object handle
hS=hAx.Children;        % the children of the axes 2-array
hS=hS{2};               % the surface handle is second of the two
X=hS.XData;
etc., ...

Given the roundabout of the above, I'd suggest the more direct

>> hS=findobj(hF,'type','surface')
hS = 
  Surface with properties:

       EdgeColor: 'none'
       LineStyle: '-'
       FaceColor: 'flat'
    FaceLighting: 'flat'
       FaceAlpha: 1
           XData: [251×1 double]
           YData: [81×1 double]
           ZData: [81×251 double]
           CData: [81×251 double]

  Show all properties
>> 

or your original will result in same thing--

>> hS=findobj(hF,'-property','XData')
hS = 
  Surface with properties:

       EdgeColor: 'none'
       LineStyle: '-'
       FaceColor: 'flat'
    FaceLighting: 'flat'
       FaceAlpha: 1
           XData: [251×1 double]
           YData: [81×1 double]
           ZData: [81×251 double]
           CData: [81×251 double]

  Show all properties
>> 

[M M Shaky]

Thank you for your reply.

However, it's showing "Attempt to reference field of non-structure array." error, once I am running it.

Can you provide an alternative solution?

[dpb]

Oh, sorry...I left out an intermediary...the surface is a child object of the axes...

Edit above.

[M M Shaky]

Thank you again.

But, the first one is still showing the same "Attempt to reference field of non-structure array." error.

and the second one is responding with a prompt message "The selected section cannot be evaluated because it contains an invalid statement".

[dpb]

Oh. I see the first actually returns a 2x1 cell array; there's an empty GraphicsPlaceholder returned besides the Surface object. I didn't realize that; sorry. So, the first needs must dereference the second cell with

hS=hS{2};

Owing to that I'd opt for the second to retrieve the Surface object handle directly.

It (the latter) works as advertised--

>> hF=openfig('NF power_Aulayers_etch_glass-by-glass_xz.fig');
>> hS=findobj(hF,'type','surface')
hS = 
  Surface with properties:

       EdgeColor: 'none'
       LineStyle: '-'
       FaceColor: 'flat'
    FaceLighting: 'flat'
       FaceAlpha: 1
           XData: [251×1 double]
           YData: [81×1 double]
           ZData: [81×251 double]
           CData: [81×251 double]

  Show all properties
>> X=hS.XData; Y=hS.YData; Z=hS.ZData;
>> whos X Y Z
  Name        Size              Bytes  Class     Attributes

  X         251x1                2008  double              
  Y          81x1                 648  double              
  Z          81x251            162648  double              

>> 

So on that one would have to see your session code in context to be able to spot any differences.

[M M Shaky]

Thank you again.

But, It shows "Expression or statement is incomplete or incorrect." error now.

hF=openfig('NF power_Aulayers_etch_glass-by-glass_xz.fig');

hS=findobj(hF,'type','surface');

hS =

Surface with properties:

EdgeColor: 'none';

LineStyle: '-';

FaceColor: 'flat';

FaceLighting: 'flat';

FaceAlpha: 1;

XData: [251×1 double]

YData: [81×1 double]

ZData: [81×251 double]

CData: [81×251 double]

Show all properties

X=hS.XData; Y=hS.YData; Z=hS.ZData;

whos X Y Z

Name Size Bytes Class Attributes

X 251x1 2008 double

Y 81x1 648 double

Z 81x251 162648 double

[Fangjun Jiang]

Where is the error message? Can you show the commands and error message when it happened?

The fact that X, Y and Z data show up means your quoted code has been executed successfully.