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

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mohanish 2018-5-4

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编辑： MathWorks Support Team 2023-11-1

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.

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Loku Bhanu Teja R 2022-11-2

在 MATLAB Online 中打开

function Detection_lines_width()
image=imread('Vegetables.png');
A= rgb2gray(image);
rotA =imrotate(A,0,'crop');
figure;
xy=[];
for l=1:length(lines)
    if eq(lines(l).point1(1),lines(l).point2(1))
        dist=abs(lines(l).point1(2)-lines(l).point2(2));
    else
        dist=abs(lines(l).point1(l)-lines(l).point(1));
    end
    if dist>len
        xy=[xy,lines(l)];
    end
end
for k=1:length(xy)-1
    if eq(xy(k).point1(1),xy(k+1).point1(1)) || eq(xy(k).point2(1),xy(k+1).point2(1))
        if(xy(k).point1(2)<xy(k+1).point1(2))
            rect=[xy(k).point1(1) xy(k).point1(2) abs(xy(k).point1(1)-xy(k).point2(1)) abs(xy(k).point1(2)-xy(k+1).point1(2)) ];
        else
            rect=[xy(k+1).point1(1) xy(k+1).point1(2) abs(xy(k).point1(1)-xy(k).point2(1)) abs(xy(k).point1(2)-xy(k+1).point1(2)) ];
        end
    elseif eq(xy(k).point1(2),xy(k+1).point1(2)) || eq(xy(k).point2(2),xy(k+1).point2(2))
        if xy(k).point1(1)<xy(k+1).point1(1)
            rect=[xy(k).point2(1) xy(k).point2(2) abs (xy(k).point1(2)-xy(k).point2(2)) abs (xy(k).point1(1)-xy(k+1).point1(1))];
        else
            rect=[xy(k+1).point2(1) xy(k+1).point2(2) abs (xy(k).point1(2)-xy(k).point2(2)) abs (xy(k).point1(1)-xy(k+1).point1(1))];
        end
    end
end
if rect(4)>width
    rectangle('position',rect,'Linewidth',2,'EdgeColor','r')
end
end

This is my code and i am getting an error saying Dot indexing is not supported for variables of this type.

Walter Roberson 2022-11-2

lines is not defined by that code.

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采纳的回答

Walter Roberson 2018-7-1

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在 MATLAB Online 中打开

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

set(handles.edit6,'string',fullname);

edit6 = findobj(0, 'tag', 'edit6');
set(edit6, 'string', fullname);

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jianpeng 2022-3-23

Warning: Error executing a listener callback for the event ButtonExited defined for class matlab.graphics.primitive.canvas:

Error using getDatetimeSettings

The default value of the property 'MonthsOfYear' in class 'datetime' is invalid:

Variables of this type do not support indexing with points.

What is the reason for this error in the drawing, please answer thank uu！！！！

Walter Roberson 2022-3-23

@jianpeng

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.

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elvis danso 2019-5-11

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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!

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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.

https://www.mathworks.com/matlabcentral/answers/399058-how-to-resolve-the-dot-indexing-not-supported-for-this-type-of-variable-error#comment_590772

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Steven Lord 2018-5-29

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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.

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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.

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Anudeep Peddi 2019-2-23

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在 MATLAB Online 中打开

filename = 'users/anudeep/desktop/a11.txt';
delimiterIn = ' ';
headerlinesIn = 1;
A = importdata(filename,delimiterIn,headerlinesIn);
for k = [3:5]
   disp(A.colheaders{1, k})
   disp(A.data(:, k))
   disp(' ')
end

I am getting an error "Dot indexing is not supported for variables of this type".

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Walter Roberson 2019-2-23

When importdata does not detect any text then it returns a numeric matrix not a struct .

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Charanraj 2019-11-28

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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.

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Charanraj 2019-11-28

编辑：Charanraj 2019-11-28

Thanks Image Analyst.

For close_system(gcb), I don't get any results in command window.

For power_initstates(bdroot(gcb),gcb), I get the following-

Dot indexing is not supported for variables of this

type.

Error in power_initstates_pr

Error in power_initstates (line 28)

power_initstates_pr(varargin{:});

Error while evaluating UIControl Callback.

Thanks

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.

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Julián Aristizabal 2020-5-6

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在 MATLAB Online 中打开

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)

feval(varargin{:});

Error in interfaz_temp (line 42)

gui_mainfcn(gui_State, varargin{:});

Error in

matlab.graphics.internal.figfile.FigFile/read>@(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.

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Julián Aristizabal 2020-5-6

And what kind ok block can I change for the constant in order to the simulation never stops?

Walter Roberson 2020-5-6

在 MATLAB Online 中打开

set_param('temperatura_pid', 'StopTime', 'inf')

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ABDULLAH DURMUS 2020-5-13

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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

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ABDULLAH DURMUS 2020-5-13

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 {});

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Zakarya Motea 2022-3-3

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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

type

close_system('modelname')

if it ask for saving

save_system('modelname')

if this going to happen too many times just embeed this code in the section of the code for closing the GUI.

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kevin harianto 2022-4-6

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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.

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Alon Zaharony 2022-4-28

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

Solution for "App designer: Dot indexing is not supported for variables"

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Jiale Ji 2022-8-16

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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:

https://www.mathworks.com/matlabcentral/fileexchange/81213-split-hopkinson-pressure-bar-graphical-analysis-tool?s_tid=srchtitle_SHPB%2520Graphical%2520Analysis%2520Tool_2

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!

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Walter Roberson 2022-8-17

Looking at the tutorial briefly, it appears that tool requires MS Windows with Excel installed ? We would probably also need an example data file to test with.

Jiale Ji 2022-8-17