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Steady-State Settings🔗

Steady State Compiler options🔗

Option Default Description
hand_guided_tearing True If enabled, hand-guided tearing of the equation system is performed.
generate_html_diagnostics False If enabled, model diagnostics are generated in HTML format. This includes the flattened model, connection sets, alias sets and BLT form.
equation_sorting True If enabled, then the equation system is separated into minimal blocks that can be solved sequentially.
expose_scalar_equation_ blocks_in_interactive_fmu True If enabled, unsolved scalar equations will be exposed to the external solver when generating interactive fmu.
divide_by_vars_in_tearing True If enabled, a less restrictive strategy is used for solving equations in the tearing algorithm. Specifically, division by parameters and variables is permitted, by default no such divisions are made during tearing.
merge_blt_blocks True If this option is set to true (default is false), BLT blocks will be constructed so that all level-one HGT pairs and all unpaired HGT will reside inside the same BLT block.
automatic_tearing True If enabled, then automatic tearing of equation systems is performed.
variability_propagation False If enabled, the compiler performs a global analysis on the equation system and reduces variables to constants and parameters where applicable.
interactive_fmu True If enabled, the DAE system is converted into an interactive fmu where all residual equations and iteration variables have been changed into top level outputs and inputs.
index_reduction False If enabled, then index reduction is performed for high-index systems
local_iteration_in_tearing annotation This option controls whether equations can be solved locally in tearing. Possible options are: 'off', local iterations are not used (default). 'annotation', only equations that are annotated are candidates. 'all', all equations are candidates
include_protected_variables False Includes protected variables in the compilation target interface if the protection annotation on the class allows viewing variables.
c_compiler gcc The C compiler to use to compile generated C code.

Steady State Solver options🔗

Option Default Description
max_iter_no_jacobian 1 Maximum number of iterations without Jacobian update. Value 1 means an update in every iteration. [1, 1000] (Corresponding compiler option: nle_solver_max_iter_no_jacobian)
tolerance 0.00001 Relative tolerance [eps(1), 0.1]. (Corresponding compiler option: nle_solver_default_tol)
step_limit_factor 1 Factor used to limit the step size based on nominal and min/max range [0.01, 100]. Newton step length is limited so that for any iteration variable xi it is not larger than step_limit_factor times min(max(abs(nominal), abs(xi)),(xi_max-xi_min)). (Corresponding compiler option: nle_solver_step_limit_factor)
jacobian_calculation_mode 9 Mode for how to calculate the Jacobian: 0 - one-sided differences, 1 - central differences, 2 - central differences at bound, 3 - central differences at bound and 0, 4 - central differences in the second Newton solve, 5- central differences at bound in the second Newton solve, 6 - central differences at bound and 0 in second Newton solve, 7 - central differences when small residual, 8 - calculate Jacobian through MATLABĀ®, 9 - Jacobian compression. (Corresponding compiler option: nle_jacobian_calculation_mode)
residual_equation_scaling 5 Residual equation scaling mode: 0 - no scaling, 1 - automatic scaling, 2 - manual scaling, 3 - hybrid scaling, 4 - aggressive automatic scaling, 5 - automatic rescaling at full Jacobian update. (Corresponding compiler option: residual_equation_scaling)