isvalid
Determine whether instrument objects are valid
Syntax
out = isvalid(obj)
Arguments
| An instrument object or array of instrument objects. |
| A logical array. |
Description
out = isvalid(obj) returns the logical
array 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 objects.
Examples
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];
isvalid(garray)
ans =
1 0Tips
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 clear command.
Version History
Introduced before R2006a
