IF statement not executing

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shnrndll
shnrndll 2022-1-5
评论： shnrndll 2022-1-6
% 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.
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shnrndll
shnrndll 2022-1-5
Well the IF condition line equates to Plot, during debugging, the breakpoint of this line displayed ".Value" equating to Plot
Walter Roberson
Walter Roberson 2022-1-5
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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采纳的回答

Image Analyst
Image Analyst 2022-1-5
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
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Image Analyst
Image Analyst 2022-1-6
What do you notice if we simplify it to
app.X = app.UITable2.Data(:,3);
app.Y = app.UITable2.Data(:,31);
whos app.X % Look in command window for this
whos app.Y % Look in command window for this
app.s = scatter(app.X, app.Y); % Might plot in some different axes control though
What do you see in the command window, and on your GUI? The data types should be there inthe command window, plus any error messages.
shnrndll
shnrndll 2022-1-6
Thank you I solved this with you code

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