int GRBsetintattrelement ( GRBmodel *model,
    const char *attrname,
    int element,
    int newvalue )

Set a single value in an integer-valued array 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 an integer-valued array attribute. Available attributes are listed and described in the Attributes section of this document.

element: The index of the array element to be changed.

newvalue: The value to which the attribute element should be set.

Important note:

Note that this method should be used for array attributes only (i.e., variable or constraint attributes). To modify a scalar attribute (i.e., a model attribute), use GRBsetintattr instead.

Example usage:

  error = GRBsetintattrelement(model, "VBasis", 0, GRB_BASIC);

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