Query the values of a character-valued array attribute.
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.
model: A loaded optimization model, typically created by routine GRBnewmodel or GRBreadmodel.
attrname: The name of a character-valued array attribute. Available attributes are listed and described in the Attributes section of this document.
start: The index of the first entry in the array to retrieve.
len: The number of array entries to retrieve.
values: A pointer to the location where the array attribute should be returned. Note that the result array must be as long as the requested sub-array.
char vtypes[NUMVARS]; error = GRBgetcharattrarray(model, "VType", 0, NUMVARS, vtypes);