Initializing help system before first use

# BARHGOPS

Description | Bit-vector control (see Section Bit-vector controls) options for the hybrid gradient algorithm. Bits 1, 2 and 3 control which norms of the coefficient matrix are used for solution normalization. The normalization factor is the maximum of the selected norms. By default, or if all three bits are set to 0, the infinity norm is used. The omega parameter referenced in bits 4, 5 and 6 is a measure of the relative magnitudes of the objective and the right-hand side.
Type | Integer
Topic areas | Primal Dual Hybrid Gradient, Bit-vector
Values |
Bit | Meaning
0 | Use an asymmetric average for the primal averaging.
1 | Use the 1-norm of the coefficient matrix in normalizing the initial solution.
2 | Use the 2-norm of the coefficient matrix in normalizing the initial solution.
3 | Use the infinity norm of the coefficient matrix in normalizing the initial solution.
4 | Use L2 norm to measure solution quality.
5 | Contract omega towards 1 if the infeasibility is small enough.
6 | Omega is based on the infeasibility.
Default value | 24, the infinity norm is used for initialization and the L2 norm for measuring the solution quality.
Affects routines | XPRSlpoptimize ( LPOPTIMIZE).
Category | Control

Parent Topic Control Parameters

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