IF statement not executing

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shnrndll
shnrndll on 5 Jan 2022
Commented: shnrndll on 6 Jan 2022
% Value changed function: ActionDropDown_2
function ActionDropDown_2ValueChanged(app, event)
if app.ActionDropDown_2.Value == "Plot"
app.Tbl = app.UITable2.Data(:,{'DATE', 'AVAILABILITY'});
app.X = app.UITable2.Data(:,3);
app.Y = app.UITable2.Data(:,31);
plot(app.UIAxes,app.X,app.Y)
end
end
The callback function operates as expected, once called, the debug arrow reaches breakpoint of the IF statment line but once I chose to "Continue" the debug arrow jumps straight to END. Not executing any of the following lines to define Tbl, X, or Y and no plot.
  6 Comments
Walter Roberson
Walter Roberson on 5 Jan 2022
Put a breakpoint at the if. When you arrive there, command
class(app.ActionDropDown_2.Value)
if char(app.ActionDropDown_2.Value)
disp('char')
disp(double(app.ActionDropDown_2.Value))
elseif isstring(app.ActionDropDown_2.Value)
disp('string')
disp(double(app.ActionDropDown_2.Value{1}))
else
disp('other')
disp(app.ActionDropDown_2.Value)
end
and tell us what the output is.
This is not intended as permanent code: it is only intended to help debug the problem.

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Accepted Answer

Image Analyst
Image Analyst on 5 Jan 2022
You need to check the index of the drop down list, or else get the selected string and compare the that string (only) to "Plot" using the contains() function:
% Value changed function: ActionDropDown_2
function ActionDropDown_2ValueChanged(app, event)
% Check the index of the selected item.
selectedIndex = app.ActionDropDown_2.Value;
% Method #1:
%if selectedIndex == 3 % or whatever number in the list it is.
% Rest of "if" block follows...
% Or use Method #2:
% Check the selected string. First get all strings in the list.
allStrings = app.ActionDropDown_2.String;
% Get the specific one that was selected.
selectedString = allStrings{selectedIndex};
% See if it says "Plot".
if contains(selectedString, "Plot", 'IgnoreCase', true)
% They chose plot, so do the plotting.
app.Tbl = app.UITable2.Data(:,{'DATE', 'AVAILABILITY'});
app.X = app.UITable2.Data(:,3);
app.Y = app.UITable2.Data(:,31);
plot(app.UIAxes,app.X,app.Y)
end
end
  3 Comments
shnrndll
shnrndll on 6 Jan 2022
Thank you I solved this with you code

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