dynamic title in app.UIAxes won't work

Good evening,

Apearantly im doing something completely worng therefore the next question. I have a UIAxes on my canvas and want to make the title dynamic. So the name of the title will change according certain radioboxes I have. I created a function but when the function gets called and prepare the string then the title will be set and I get an error.

%This part happens in the plot function which was working until I tried to
%fix the title, in properties header is defined
app.strOpt = 'Cumulative';
app.strData = 'Cases';
header = app.PlotTitles();
title(app.UIAxes, header ); 

Than I have a function as below:

function Out = PlotTitles(app)
str = strcat({app.strData}, {' of COVID-19 '}, {app.strOpt});
disp(str)

select = app.CountryListBox.Value;

t = strcmp(select, 'Global');

   if t == 0            
        Out = strcat({str}, {' in '},{app.CountryListBox.Value});
        disp(Out)        
    else
       Out = strcat({'Global '}, {str});
        disp(Out)
   end    
end

I get an error that tells me that:

Error using matlab.graphics.primitive.Text/set

Error setting property 'String' of class 'Text':

I do no tunderstand what goes wrong, I used the disp() function to see what goes fine disp(str) works but disp(out) doesn't show anything on the command window.

Coul danybody tell what I do wrong, thanks in advance

Answer 1

[Cris LaPierre]

Your function is working, but it is returning a 1x3 cell array. Title does not accept a cell array of cells.

When building your strings using strcat, only put the character vectors in curly braces. Here's a simplified example.

%This part happens in the plot function which was working until I tried to
%fix the title, in properties header is defined
app.strOpt = 'Cumulative';
app.strData = 'Cases';
header = PlotTitles(app);

    {'Cases of COVID-19 Cumulative'}

    {'Cases of COVID-19 Cumulative in United States'}

title(header);

function Out = PlotTitles(app)
str = strcat(app.strData, {' of COVID-19 '}, app.strOpt);
disp(str)

app.CountryListBox.Value = 'United States';

Out = strcat(str, {' in '},app.CountryListBox.Value);
disp(Out)

end

[Raymond Gilbers]

Thank you very much I really did not see this error great lesson for me .