isvalid (serial) - Determine whether serial port objects are valid
Syntax
out = isvalid(obj)
Description
out = isvalid(obj) returns
the logical array out, which contains a 0 where
the elements of the serial port object, obj are
invalid serial port objects and a 1 where the elements
of obj are valid serial port objects.
Remarks
obj becomes invalid after it is removed from
memory with the delete function.
Because you cannot connect an invalid serial port object to the device,
you should remove it from the workspace with the clear command.
Example
Suppose you create the following two serial port objects.
s1 = serial('COM1');
s2 = serial('COM1');s2 becomes invalid after it is deleted.
delete(s2)
isvalid verifies that s1 is
valid and s2 is invalid.
sarray = [s1 s2];
isvalid(sarray)
ans =
1 0See Also
Functions
clear, delete
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