Determine whether instrument objects are valid
out = isvalid(obj)
An instrument object or array of instrument objects.
A logical array.
out = isvalid(obj) returns the logical
out, which contains a 0 where the elements of
obj are invalid instrument objects and a 1 where the elements
obj are valid instrument objects.
Suppose you create the following two GPIB objects:
g1 = gpib('ni',0,1); g2 = gpib('ni',0,2);
g2 becomes invalid after it is deleted.
isvalid verifies that
g1 is valid and
g2 is invalid.
garray = [g1 g2]; isvalid(garray) ans = 1 0
obj becomes invalid after it is removed from memory with the
delete function. Because you
cannot connect an invalid object to the instrument, you should remove it from the
workspace with the