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Variable Attributes
These are variable attributes, meaning that they are associated with
specific variables in the model. You should use one of the various
get routines to retrieve the value of an attribute. These are
described at the beginning of
this section).
For the object-oriented interfaces, variable attributes are retrieved
by invoking the get method on a variable object. For
attributes that can be modified directly by the user, you can use one
of the various set methods.
Attempting to query an attribute that is not available will produce an
error. In C, the attribute query routine will return a
GRB_ERROR_DATA_NOT_AVAILABLE error code. The object-oriented
interfaces will throw an exception.
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