how to resolve the 'dot indexing not supported for this type of variable' error when creating GUIs with GUIDE?

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I am writing a code where I hit a pushbutton, it shows me a error saying "Dot indexing is not supported for variables of this type". And this error is for the line 268-- set(handles.edit6,'string',fullname); fullname is basically the filepath and filename combined together.
Any kind of help will be appreciated. Thank you.
  20 个评论



Walter Roberson
Walter Roberson 2018-7-1
You used GUIDE to construct these GUIs.
When you use GUIDE, then the "handles" structure that is passed into your function always refers to information stored against the figure that the graphic element is in. "handles" is not a global structure, it is a per-GUI structure, and you have constructed three separate GUI.
You need to change
edit6 = findobj(0, 'tag', 'edit6');
set(edit6, 'string', fullname);
  10 个评论
Walter Roberson
Walter Roberson 2022-3-23
I think we are going to need your code -- and your .fig too if you used GUIDE. You can attach them.
... though I suspect that you might have some third-party code that is interfering with MATLAB.


更多回答(11 个)

elvis danso
elvis danso 2019-5-11
You get this error when you open GUI straight from the .fig directly. Do not do so, instead from the .m script opened at the editor, click the run button to open the GUI. That is the magic!
  1 个评论
Walter Roberson
Walter Roberson 2019-5-11
This is not quite accurate for what was happening for the user. They were using multiple GUIDE-created GUIs, not realizing that the handles structure managed by GUIDE is always relative to the figure (there is no global one for all of the GUIs together.)
They were also specifically using open_fig() on the extra GUIs rather than executing the GUIs. This has the same underlying issue as you refer to, that this does not execute the initialization code for that GUI. However, the solution for them is not to go to the editor and click the Run button, as they were opening the extra GUIs under program control, so they needed to execute the sub-GUIs by name (to cause their initialization to be run) instead of just lauching the figure.


Steven Lord
Steven Lord 2018-5-29
Set an error breakpoint and run your code. If this problem occurs again, MATLAB will enter debug mode where the error occurs. Examine the variables on that line. If the error occurs on the line 268 that you quoted ( set(handles.edit6,'string',fullname) ) I'm almost certain that the problem is what Guillaume suggested, that handles is not a struct array as you expected it to be.
  1 个评论
Walter Roberson
Walter Roberson 2019-1-5
You have not given us the source for some of the functions. You have not given us the code that sets local. You have not given us the external functions you invoke. You have not told us the exact line the problem occurs on. You have barely commented the code.
We are not going to be able to debug this for you.


Anudeep Peddi
Anudeep Peddi 2019-2-23
filename = 'users/anudeep/desktop/a11.txt';
delimiterIn = ' ';
headerlinesIn = 1;
A = importdata(filename,delimiterIn,headerlinesIn);
for k = [3:5]
disp(A.colheaders{1, k})
disp(, k))
disp(' ')
I am getting an error "Dot indexing is not supported for variables of this type".

Charanraj 2019-11-28
I got a similar error of Dot indexing. But unable to find loop where the error exists :( I have attached a pic that tells about the error when I try to initial voltage for a capacitor in simscape using simulink.
Any guess or guideline to correct this error can be helpful. Thanks in advance.
  3 个评论
Walter Roberson
Walter Roberson 2019-11-28
It looks to me as if you are using Simulink, possibly SimScape Electrical (formerly SimPowerSystems). The error appears to be happening somewhere while executing the MaskDialog callback of powergui . The line with the error appears to be within a .p file or similar. I cannot tell what is happening. It might be a bug.


Julián  Aristizabal
That´s the code:
rto = get_param('temperatura_pid/Gain1', 'RuntimeObject');
str = num2str(rto.OutputPort(1).Data);
statestxt =findobj('Tag', 'Resultado');
set(statestxt, 'string', str);
n=str2num(get(statestxt, 'String'));
That´s the error:
Dot indexing is not supported for variables of this type.
Error in interfaz_temp>Visualizar_Callback (line 135)
str = num2str(rto.OutputPort(1).Data);
Error in gui_mainfcn (line 95)
Error in interfaz_temp (line 42)
gui_mainfcn(gui_State, varargin{:});
Error in>@(hObject,eventdata)interfaz_temp('Visualizar_Callback',hObject,eventdata,guidata(hObject))
Error while evaluating UIControl Callback.
I don´t know what is wrong, thanks for your help.
  8 个评论


编辑:ABDULLAH DURMUS 2020-5-13
Hello, I'm new to matlab. I need your help for my homework.
I get the error for when I run it through the GUI. I did not receive an error when I run it through the editor.
error: Dot indexing is not supported for variables of this type.
Error in untitled> pushbutton1_Callback (line 93) axes (handles.axes1); Error in gui_mainfcn (line 95) feval (vararg the {}); Error in untitled (line 42) gui_mainfcn (gui_State, varargin {:});
Can you help for the solution
Thank you
  1 个评论
My code on line 42: gui_mainfcn (gui_State, varargin {:}); My code on line 93: axes (handles.axes1); and My code on line 95: feval (vararg the {});


Zakarya Motea
Zakarya Motea 2022-3-3
Also make sure that the model like simulink model being called from that function is not opened in another directory. this was the main problem for me, in order to make sure that the model is closed
if it ask for saving
if this going to happen too many times just embeed this code in the section of the code for closing the GUI.

kevin harianto
kevin harianto 2022-4-6
编辑:Stephen23 2022-4-6
i got a Dot indexing is not supported for variables of this type.
Error in (line 163)
image = ptcloud.Location;
Error in ()
I = helperPointCloudToImage(Location);
as well for this code: (goal is to increase pointCloud resolution to be at minimum 64, 1856, 5 at the end)
EDIT: copyright code removed.

Alon Zaharony
Alon Zaharony 2022-4-28
Here is how i solved this issue. Not sure if that solution is relevant for all the cases, but worth a try:

Jiale Ji
Jiale Ji 2022-8-16
编辑:Jiale Ji 2022-8-16
Hello, I am a begineer on Matlab. Recently, I download an open-source tool to deal with some data. The Link is here:
While I was using the ' Rough Crop' function, the error is always ' Dot indexing is not supported for variables of this type'.
I attach the Code and some pics here.
Any help or tips are really helpful to me. I really appreciate it.
Thank you!

Sharath 2022-12-28
i am new to matlab, what should i write code for callback in 'app designer'
  1 个评论
Walter Roberson
Walter Roberson 2022-12-28
You have not defined what you want the App Designer callback to do
These days you would generally configure your model for Single Simulation Output and you would invoke sim() to run the model, and then extract the appropriate information from the simulation output object. See for example



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