Determine whether serial port objects are valid
out = isvalid(obj)
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.
Suppose you create the following two serial port objects.
s1 = serial('COM1'); s2 = serial('COM1');
s2 becomes invalid after it is deleted.
isvalid verifies that s1 is valid and s2 is invalid.
sarray = [s1 s2]; isvalid(sarray) ans = 1 0