GRBVar#
-
class GRBVar#
Gurobi variable object. Variables are always associated with a particular model. You create a variable object by adding a variable to a model (using
GRBModel::addVar
), rather than by using aGRBVar
constructor.The methods on variable objects are used to get and set variable attributes. For example, solution information can be queried by calling
get
(GRB_DoubleAttr_X
). Note that you can also query attributes for a set of variables at once. This is done using the attribute query method on theGRBModel
object (GRBModel::get
).-
char get(GRB_CharAttr attr)#
Query the value of a char-valued attribute.
- Parameters:
attr – The attribute being queried.
- Returns:
The current value of the requested attribute.
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double get(GRB_DoubleAttr attr)#
Query the value of a double-valued attribute.
- Parameters:
attr – The attribute being queried.
- Returns:
The current value of the requested attribute.
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int get(GRB_IntAttr attr)#
Query the value of an int-valued attribute.
- Parameters:
attr – The attribute being queried.
- Returns:
The current value of the requested attribute.
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string get(GRB_StringAttr attr)#
Query the value of a string-valued attribute.
- Parameters:
attr – The attribute being queried.
- Returns:
The current value of the requested attribute.
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int index()#
This method returns the current index, or order, of the variable in the underlying constraint matrix.
Note that the index of a variable may change after subsequent model modifications.
- Returns:
-2: removed, -1: not in model, otherwise: index of the variable in the model
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bool sameAs(GRBVar var2)#
Check whether two variable objects refer to the same variable.
- Parameters:
var2 – The other variable.
- Returns:
Boolean result indicates whether the two variable objects refer to the same model variable.
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void set(GRB_CharAttr attr, char newvalue)#
Set the value of a char-valued attribute.
- Parameters:
attr – The attribute being modified.
newvalue – The desired new value of the attribute.
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void set(GRB_DoubleAttr attr, double newvalue)#
Set the value of a double-valued attribute.
- Parameters:
attr – The attribute being modified.
newvalue – The desired new value of the attribute.
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void set(GRB_IntAttr attr, int newvalue)#
Set the value of an int-valued attribute.
- Parameters:
attr – The attribute being modified.
newvalue – The desired new value of the attribute.
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void set(GRB_StringAttr attr, const string &newvalue)#
Set the value of a string-valued attribute.
- Parameters:
attr – The attribute being modified.
newvalue – The desired new value of the attribute.
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char get(GRB_CharAttr attr)#