Documentation


GRBgetstrattrelement

int GRBgetstrattrelement ( GRBmodel *model,
    const char *attrname,
    int element,
    char **valueP )

Query a single value from a string-valued array attribute.

Return value:

A non-zero return value indicates that a problem occurred while querying 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.

Arguments:

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

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

element: The index of the requested array element.

valueP: A pointer to the location where the requested value should be returned.

Important notes:

Note that all interface routines that return string-valued attributes are returning pointers into internal Gurobi data structures. The user should copy the contents of the pointer to a different data structure before the next call to a Gurobi library routine. The user should also be careful to never modify the data pointed to by the returned character pointer.

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

Example usage:

  char **varname;
  error = GRBgetstrattrelement(model, "VarName", 1, varname);