isvalid - True for undeleted OPC Toolbox objects
Syntax
A = isvalid(Obj)
Description
A = isvalid(Obj) returns
a logical array, A, that contains false where
the elements of Obj are deleted OPC Toolbox objects
and true where the elements of Obj are
valid objects.
Use the clear command
to clear an invalid toolbox object from the workspace.
Examples
Create two valid OPC data access objects, and then delete one
to make it invalid:
da(1) = opcda('localhost','Dummy.ServerA');
da(2) = opcda('localhost','Dummy.ServerB');
out1 = isvalid(da)
% Delete the first object and show it is invalid:
delete(da(1))
out2 = isvalid(da)
% Delete the second object and clear the object array:
clear da
See Also
delete | opchelp
 | getnamespace | | load |  |
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