These words control the amount of output that is required at each iteration of the optimization procedure. The PRINT-LEVEL keyword indicates the level of printing required. If no printing is required at all, the integer value following the keyword should be set non-positive. A single line summary of a specific iteration results if the integer is set to 1; this summary is expanded slightly when the integer is set to 2. Details of the current estimate of the optimum value are printed if the integer is larger than 2 and an increasing level of output is available by selecting larger integer values. A full debugging print occurs when the integer is set larger than 100.
The printing starts when the iteration specified on the START-PRINTING-AT-ITERATION iteration is reached and stops after the STOP-PRINTING-AT-ITERATION iteration is passed. Printing occurs at regular intervals. The exact interval may be specified using the ITERATIONS-BETWEEN-PRINTING option. The default settings are