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Debugging in application problem

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Hello, I am having problems with my App while Debugging. In Figure-1, data and places seem to be empty, but this is not the case when I remove the breakpoint because it works well, so I had inserted a different breakpoint in an another function and I saw that everything is as it should be.(Figure-2). I can keep working on, but I think that I should post this.(I am very new to programming and Matlab, sorry for any mistakes in this post)
function StartupFcn(app)
load covid_data.mat covid_data
countries = string(unique(covid_data(2:end,1)));
M = splitapply(@(x) {x}, covid_data(2:end,2:end).', findgroups(covid_data(2:end,1).'));
app.Global = Object_constructor("Global");
app.Global.data = cell2mat(covid_data(2:end, 3:end));
app.Dates = string(covid_data(1,3:end));
app.Global.places = Object_constructor(countries);
for ii=1:numel(countries)
country_data = M{ii};
app.Global.places(ii).data = cell2mat(country_data(2:end,1));
app.Global.places(ii).data(1,3)= app.Global.places(ii).data(1,1);
app.Global.places(ii).data(1,4)= app.Global.places(ii).data(1,2);
for pp=1:size(country_data(2:end,1),1)-1
temp=app.Global.places(ii).data(pp+1,1)-app.Global.places(ii).data(pp,1);
temp2=app.Global.places(ii).data(pp+1,2)-app.Global.places(ii).data(pp,2);
if temp > 0
app.Global.places(ii).data(pp+1,3)= temp;
else
app.Global.places(ii).data(pp+1,3)=0;
end
if temp2 > 0
app.Global.places(ii).data(pp+1,4)= temp2;
else
app.Global.places(ii).data(pp+1,4)=0;
end
end
app.Global.places(ii).places = Object_constructor(string(country_data(1,2:end)));
for jj=1:size(country_data(1,2:end),2)
state_data = country_data(2:end, jj+1);
app.Global.places(ii).places(jj).data = cell2mat(state_data);
if isempty(app.Global.places(ii).places(1).name)
app.Global.places(ii).places(jj).data(1,3) = app.Global.places(ii).places(jj).data(1,1);
app.Global.places(ii).places(jj).data(1,4) = app.Global.places(ii).places(jj).data(1,2);
for pp=1:size(country_data(2:end,1),1)-1
temp = app.Global.places(ii).places(jj).data(pp+1,1) - app.Global.places(ii).places(jj).data(pp,1);
temp2 = app.Globa.places(ii).places(jj).data(pp+1,2) - app.Global.places(ii).places(jj).data(pp,2);
if temp > 0
app.Global.places(ii).places(jj).data(pp+1,3)= temp;
else
app.Global.places(ii).places(jj).data(pp+1,3)=0;
end
if temp2 > 0
app.Global.places(ii).places(jj).data(pp+1,4)= temp2;
else
app.Global.places(ii).places(jj).data(pp+1,4)=0;
end
end
end
end
app.HoleCases = sum(app.Global.data(:,1:2:end-1));% I insert breakpoint here and I cannot see the places and data as can be seen in the Figure-1
app.HoleDeaths = sum(app.Global.data(:,2:2:end));
app.CountryListBox.Items = ["Global",app.Global.places.name];
app.StateorRegionListBox.Items = "All";
app.AveragedofdaysSlider.Value = 1;
app.DailyData();
app.Country = 0;
app.CasesButton.Value = 1;
app.PlotCases();
end
end

  2 Comments

Ameer Hamza
Ameer Hamza on 11 Oct 2020
It depends on where you add the breakpoint. For example, these values are assigned in this for loop
for ii=1:numel(countries)
If you add a breakpoint before these values are assigned, you will get empty vectors.
Berkay Yaldiz
Berkay Yaldiz on 11 Oct 2020
Yes, I added the breakpoint at the end of this for loop
for ii=1:numel(countries)
Moreover, when I comment these lines:
if isempty(app.Global.places(ii).places(1).name)
app.Global.places(ii).places(jj).data(1,3) = app.Global.places(ii).places(jj).data(1,1);
app.Global.places(ii).places(jj).data(1,4) = app.Global.places(ii).places(jj).data(1,2);
for pp=1:size(country_data(2:end,1),1)-1
temp = app.Global.places(ii).places(jj).data(pp+1,1) - app.Global.places(ii).places(jj).data(pp,1);
temp2 = app.Globa.places(ii).places(jj).data(pp+1,2) - app.Global.places(ii).places(jj).data(pp,2);
if temp > 0
app.Global.places(ii).places(jj).data(pp+1,3)= temp;
else
app.Global.places(ii).places(jj).data(pp+1,3)=0;
end
if temp2 > 0
app.Global.places(ii).places(jj).data(pp+1,4)= temp2;
else
app.Global.places(ii).places(jj).data(pp+1,4)=0;
end
end
end
Those vectors are not empty anymore. Basically, I cannot insert a breakpoint in the startup function.

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Accepted Answer

Gaurav Garg
Gaurav Garg on 14 Oct 2020
Hey Berkay,
This seems to be the expected behvaiour of the debugger.
For the case in figure 1, I hope that the values in the variables places and data get the values assigned after you press 'Continue' on debugger.

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