Determine whether instrument objects are valid
An instrument object or array of instrument objects.
A logical array.
the logical array out = isvalid(obj) out, which contains a 0 where
the elements of obj are invalid instrument objects
and a 1 where the elements of obj are valid instrument
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. delete(g2) isvalid verifies that g1 is
valid and g2 is invalid. garray = [g1 g2];
More About expand all obj becomes invalid after it is removed from
memory with the function.
Because you cannot connect an invalid object to the instrument, you
should remove it from the workspace with the delete command. clear
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