Clear Filters
Clear Filters

Why does my cell array remain empty?

3 views (last 30 days)
I'm trying to find all checkboxes in a specific panel that are checked, get their tags/names and perform different actions depending on how many of them are checked.
I tried it like this but the cell array remains empty (cell array in question is "selected_names"):
% Find all the checkbox objects belonging to features
checkboxes = findall(app.features,'type','uicheckbox');
% Initialize an empty cell array to store the names of the selected checkboxes
selected_names = {};
% Loop through the checkboxes and check which ones are selected
for i=1:numel(checkboxes)
if get(checkboxes(i), 'Value') == 1
% If the checkbox is selected, add its name to the cell array
selected_names{end+1} = get(checkboxes(i), 'Tag');
if numel(selected_names) == 3
app.analyzer.histograms_3D(selected_names{1}, selected_names{2}, selected_names{3}, app.axFeatures);
elseif numel(selected_names) == 2
app.analyzer.histograms_gaussians(selected_names{1}, selected_names{2}, app.axFeatures);
elseif numel(selected_names) == 1
app.analyzer.histogram(selected_names{1}, app.axFeatures)
% Display error prompt for no selected checkboxes or more than 3
errordlg("Please select between 1 and 3 checkboxes.", "Invalid Selection");
How do I fix this?
Kevin Gjoni
Kevin Gjoni on 28 Jan 2023
yes, this returns the checkboxes in my specified panel
Walter Roberson
Walter Roberson on 28 Jan 2023
What shows up for
? in particular are there any nonzero values?
Does the code contain any pause() or uiwait() or waitfor() or drawnow() between the point at which the user clicks and the time this function executes?

Sign in to comment.

Accepted Answer

dpb on 28 Jan 2023
Moved: dpb on 28 Jan 2023
We can't debug what we don't have, which is a sample app that recreates the problem...looks like all should work just fine here although it can be made more efficient...
fig = uifigure;
pnl = uipanel(fig);
hcbx = uicheckbox(pnl);
hcbx(2).Position=hcbx(1).Position+[0 -30 0 0];
% now query them...
names=get(hcbx,'Tag'); % the assigned tag values
state=cell2mat(get(hcbx,'Value')); % array of state values (logicals)
selected_names=names(state) % and the checked ones only
...above code...
selected_names =
1×1 cell array
here. I didn't wrap it inside an app, but the logic seems sound; something must be going wrong elsewhere that the Tag values are getting trashed.
dpb on 28 Jan 2023
No problem, although if had taken suggested code at face value to begin with... :)
checkboxes = findall(app.features,'type','uicheckbox');
Both of these could/should be determined as part of the startup code and held as global parameters for the application; there's no sense in searching for the same thing every time when it is fixed application data.

Sign in to comment.

More Answers (0)


Find more on Graphics Object Programming in Help Center and File Exchange




Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!