How to plot in real time the value of a variable in Matlab App Designer?

Hi everybody,

I am writing an App to make some operations on my data. I have almost finished coding the app but I met an issue. I would like to display the value of a variable insisde a for-cycle to let the user know the progress of the app analysis. I tried with EditField but it displais only the value 1 at the end of the process, whereas I want to display in real-time the value of the variable called k that keeps track of the progress of the for-cycle. Below I attach the code of interest: can anyone help me?

Thanks you in advance!

for i=1:app.le

k=i; app.EditField.Value=fprintf('%d',k) %I want to display the value of k while it increases from cycle to cycle

text=fileread(app.str(i));

text2=strrep(text,',','.');

dlmwrite(app.str(i),text2,'delimiter','');

fidi = fopen(app.str(i),'rt')

k1 = 1;

while ~feof(fidi)

readline = fgetl(fidi);

if strcmp(readline,'Results:')

C = textscan(fidi, '%f%f%f%f %*f%*f%*f%*f%*f%*f', 'HeaderLines',9, 'CollectOutput',1);

else

C = textscan(fidi, '%f%f%f%f %*f%*f%*f%*f%*f%*f', 'HeaderLines',9, 'CollectOutput',1);

end

M = cell2mat(C);

fprintf(1,'\tSection %2d: (%4d x %d)\n', k1, size(M))

if isempty(M) % Empty Matrix Indicates End-Of-File

fprintf(1,'Reading finished, %d Sections\n',k1-1)

break

end

D{k1,:} = M;

fseek(fidi, 0, 0);

k1 = k1 + 1;

end

fclose(fidi);

Dflip = flip(D); % Reverse Section Order

app.Out = cell2mat(Dflip);

un=app.Out(:,1);

t=app.Out(:,2);

T=app.Out(:,3);

Cp=app.Out(:,4);

a=find(un==0);

b=find(un==1);

if length(a)~=length(b)

unit=b;

else unit=a;

end

extr= [diff(a);length(un)-a(end)+1];

In = mat2cell(t, extr);

for j=2:length(In)

A=In{j-1,end}; AA=A(end);

In{j,:}=In{j,:}+AA;

end

time=cell2mat(In);

app.Matr=[un t T Cp time];

app.C=strcat(app.path, 'conv_', app.A(1+i));

writematrix(app.Matr,app.C,'Delimiter','tab'); app.GotonextstepLamp.Color='g';

end

Answer 1

[Daniele Sonaglioni]

To update the value of the field while performing the for-cycle, it is enough to write:

drawnow limitrate
app.(sprintf('EditField')).Value=i   

Answer 2

[Jiri Hajek]

It should be sufficient to enforce update of your output using:

drawnow limitrate.

[Daniele Sonaglioni]

I tried to add your command in my app but it does not work. At the end of the cycle, it is not able to update the value displayed.

[Jiri Hajek]

It seems that something is not working as should. Did you try to debug the app using a breakpoint at the problematic line? Several things could go wrong when updating the value, which prevent the change of EditField value. You need to check if the code works properly when you go throught the process step by step. Please check that the value updates as expected when you execute the line manually....

[Daniele Sonaglioni]

I added a brekpoint but the value does not update automatically