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From: Corey Kelly on 9 Jul 2010 17:02
My GUI has multiple imEllipse objects, the handles for which are all stored in handles.rois. I keep track of how many ROIs have been created by incrementing a variable handles.nrois every time one is constructed. My GUI has a reset button which is meant to remove all of these ROIs and remove their handles. I currently have this set up as follows:

function resetroi_button_Callback(hObject, eventdata, handles)
for i = 1:handles.nrois
delete(handles.rois(i));
end
handles.nrois = 0;
clear handles.rois;
guidata(hObject, handles);

It doesn't seem like handles.rois is being emptied. The ROIs are being deleted, and handles.nrois is being properly reset, but the rois variable doesn't seem affected. I can overwrite the array values with new handles, but if I don't overwrite them all, I get errors regarding removed objects.
From: Walter Roberson on 9 Jul 2010 17:00
Corey Kelly wrote:
> My GUI has multiple imEllipse objects, the handles for which are all
> stored in handles.rois. I keep track of how many ROIs have been created
> by incrementing a variable handles.nrois every time one is constructed.
> My GUI has a reset button which is meant to remove all of these ROIs and
> remove their handles. I currently have this set up as follows:
>
> function resetroi_button_Callback(hObject, eventdata, handles)
> for i = 1:handles.nrois
> delete(handles.rois(i));
> end
> handles.nrois = 0;
> clear handles.rois;
> guidata(hObject, handles);
>
> It doesn't seem like handles.rois is being emptied. The ROIs are being
> deleted, and handles.nrois is being properly reset, but the rois
> variable doesn't seem affected. I can overwrite the array values with
> new handles, but if I don't overwrite them all, I get errors regarding
> removed objects.

You do not 'clear' a field of a structure: you rmfield() it.

handles = rmfield(handles, 'rois');

From: Corey Kelly on 9 Jul 2010 17:13
Walter Roberson <roberson(a)hushmail.com> wrote in message <i182rq$5gb$2(a)canopus.cc.umanitoba.ca>...
> Corey Kelly wrote:
> > My GUI has multiple imEllipse objects, the handles for which are all
> > stored in handles.rois. I keep track of how many ROIs have been created
> > by incrementing a variable handles.nrois every time one is constructed.
> > My GUI has a reset button which is meant to remove all of these ROIs and
> > remove their handles. I currently have this set up as follows:
> >
> > function resetroi_button_Callback(hObject, eventdata, handles)
> > for i = 1:handles.nrois
> > delete(handles.rois(i));
> > end
> > handles.nrois = 0;
> > clear handles.rois;
> > guidata(hObject, handles);
> >
> > It doesn't seem like handles.rois is being emptied. The ROIs are being
> > deleted, and handles.nrois is being properly reset, but the rois
> > variable doesn't seem affected. I can overwrite the array values with
> > new handles, but if I don't overwrite them all, I get errors regarding
> > removed objects.
>
> You do not 'clear' a field of a structure: you rmfield() it.
>
> handles = rmfield(handles, 'rois');

Excellent! Thanks Walter.
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