why set sentence appears just when run step by step ?

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Rana Muayad 2021-8-17

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1331492-why-set-sentence-appears-just-when-run-step-by-step

评论： Walter Roberson 2021-8-19

hi,

I have a program in the graphical interface of Matlab that has 3 push buttons, each one performs a specific task, but all of them start writing a static text sentence using set command. When executing, the first button appears, but when the other two buttons are executed, the sentence does not appear, it appears only when executing step by step. What is the reason for that?

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Rana Muayad 2021-8-19

在 MATLAB Online 中打开

in code execute the set command correctly

% --- Executes on button press in pushbutton7.
% hObject    handle to pushbutton7 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
set(handles.textwait,'string','Wait training. . . . . . . .')
global J label
imds = imageDatastore('C:\Users\User\Desktop\image classifier after processing\all file','FileExtensions',{'.tif'},'IncludeSubfolders',true,'LabelSource','foldernames');
imgs = readall(imds);
tbl=countEachLabel(imds);
minsetcount=min(tbl{:,2});
imds=splitEachLabel(imds,minsetcount,'randomize');
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but in this code not execute the set command .it executes just when it runs step by step

% --- Executes on button press in pushbutton9.
function pushbutton9_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton9 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA) 
set(handles.textwait,'string','Wait training. . . . . . . .')
global J label   
RandStream.setGlobalStream(RandStream('mrg32k3a','Seed', 7));
folder_name='C:\Users\User\Desktop\image classifier after processing\all file';
corelImageSet= imageDatastore(folder_name,'IncludeSubfolders',10,'LabelSource','foldernames');
tbl=countEachLabel(corelImageSet);
minsetcount=min(tbl{:,2});
corelImageSet=splitEachLabel(corelImageSet,minsetcount,'randomize');
[testingset,trainingset]=splitEachLabel(corelImageSet,0.2,.8,'randomized');
Totaltrainimages=numel(trainingset.Files);
net=inceptionv3;  
net.Layers(2);
net.Layers(end);
numel(net.Layers(end).ClassNames)
 . 
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Rana Muayad 2021-8-19

it's part of code not full code

Walter Roberson 2021-8-19

It would be... unusual... for someone to abbreviate full code that does not use global variables, as code that does use global variables when they post asking for advice... except possibly for cases where the poster was supplying a (semi-) working example with the global variables acting to "stub out" the rest of the program.

But the posted code was not a working example, so the only self-consistent explanation is that the full code uses global variables as well. And in that case, Rik's question of why global variables are being used is still relevant.

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Answer 1

Walter Roberson 2021-8-19

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1331492-why-set-sentence-appears-just-when-run-step-by-step#answer_770374

Screen updates are made under the following circumstances:

figure() is called to activate an existing figure
figure() is called to create a new figure
drawnow() is executed
pause() is executed
uiwait() or waitfor() are called (uiwait() calls waitfor())
program returns to keyboard execution, such as if execution finishes, or a breakpoint is reached, or the program uses keyboard()

Your code is not doing anything to request an update after changing the graphics properties, so the change to the visible display will wait until... whenever it happens.

When you need a screen update, call drawnow()