For the dense input format, the ID statement specifies a character variable in the problem data set that contains a name for each constraint coefficients row, objective coefficients row, and variable definition row. If the ID statement is omitted, the LP procedure looks for the default variable name, _ID_. If this variable is not in the problem data set, the procedure assigns the default name _OBS_ to each row, where specifies the observation number in the problem data set.

For the sparse input format, the ID statement specifies the character variables in the problem data set that contain the names of the rows in the model. Rows in the model are one of the following types: constraints, objective functions, bounding rows, or variable describing rows. The ID variables must be character variables. There must be the same number of ID variables as variables specified in the COEF statement. If the ID statement is omitted, the LP procedure looks for the default variable names having the prefix _ID.

Note:The ID statement is an alias for the ROW statement.