How to check the existence of a variable inside handles?

In GUIDE, I am creating number instances of an object & deleting some of them using the command 'delete(handles.obj.pc(index))'.

before deletion the properties are,

After excecuting deletion, the properties inside the objects got deleted. the values for the properties becomes does not exists.

Now, i am checking each created object properties to identify, the deleted objectes.

How can i check the stautus of the existance of the property vaules inside handles?

Answer 1

[Image Analyst]

Strange that it has fields but no values for the fields. Maybe try clear instead of delete. Or if the field obj is a variable you tacked on to handles, rather than a handle to a control on the figure, use rmfield()

handles = rmfield(handles, 'obj');

To check whether a structure has a certain field, you can use isfield():

fieldnames(handles) % List all fields to the command window so you can see what's there.
% Check if it has a field called obj
if isfield(handles, 'obj')
    % It has the field called obj.
else
    % It does not have a field called obj.
end

[Vinothkumar Sethurasu]

>> while using clear command getting an error -

' Error using clear

Must be a string scalar or character vector.'

>>rmfield and delete produces same results.

>>While using isfield to identify the status of existance, it returns zero (ab=0) for available fileds also.

for t=1:5

ab=isfield(handles.obj.pc(1,t),'connection_status');

if ab==1

z_con(1,t)=handles.obj.pc(1,t).connection_status;

else

z_con(1,t)=nan;

end

end

Am i missing anything in the line ' ab=isfield(handles.obj.pc(1,t),'connection_status')' ?

Answer 2

[Image Analyst]

Instead of

delete(handles.obj.pc(index));

try

handles.obj.pc(index) = [];