int GRBsetdblattr ( GRBmodel *model,
    const char *attrname,
    double newvalue )

Set the value of a double-valued model attribute.

Return value:

A non-zero return value indicates that a problem occurred while setting the attribute. Refer to the Error Code table for a list of possible return values. Details on the error can be obtained by calling GRBgeterrormsg.


model: A loaded optimization model, typically created by routine GRBnewmodel or GRBreadmodel.

attrname: The name of a double-valued model attribute. Available attributes are listed and described in the Attributes section of this document.

newvalue: The desired new value of this attribute.

Important note:

Note that this method should be used for scalar attributes only (i.e., model attributes). To modify a single element of an array attribute, use GRBsetdblattrelement instead.

Example usage:

  error = GRBsetdblattr(model, "ObjCon", 0.0);