**
You're reading an old version of this documentation.
For the latest released version, please have a look at v4.4.0.
**

# Solver Configuration¶

## Group /input/solver¶

`NTHREADS`

Number of used threads

Type:int

Range:\(\geq 1\)

Length:1

`USER_SOLUTION_TIMES`

Vector with timepoints at which the solution is evaluated

Unit:\(\mathrm{s}\)

Type:double

Range:\(\geq 0\)

Length:Arbitrary

`CONSISTENT_INIT_MODE`

Consistent initialization mode (optional, defaults to \(1\)). Valid values are:

None

Full

Once, full

Lean

Once, lean

Full once, then lean

None once, then full

None once, then lean

Type:int

Range:\(\{ 0, \dots, 7\}\)

Length:1

`CONSISTENT_INIT_MODE_SENS`

Consistent initialization mode for parameter sensitivities (optional, defaults to \(1\)). Valid values are:

None

Full

Once, full

Lean

Once, lean

Full once, then lean

None once, then full

None once, then lean

Type:int

Range:\(\{ 0, \dots, 7\}\)

Length:1

## Group /solver/time_integrator¶

`ABSTOL`

Absolute tolerance in the solution of the original system

Type:double

Range:\(> 0\)

Length:1

`RELTOL`

Relative tolerance in the solution of the original system

Type:double

Range:\(\geq 0\)

Length:1

`ALGTOL`

Tolerance in the solution of the nonlinear consistency equations

Type:double

Range:\(> 0\)

Length:1

`RELTOL_SENS`

Relative tolerance in the solution of the sensitivity systems

Type:double

Range:\(\geq 0\)

Length:1

`INIT_STEP_SIZE`

Initial time integrator step size for each section or one value for all sections (0.0: IDAS default value), see IDAS guide 4.5, p.36f.

Unit:\(\mathrm{s}\)

Type:double

Range:\(\geq 0\)

Length:\(1 / \texttt{NSEC}\)

`MAX_STEPS`

Maximum number of timesteps taken by IDAS (0: IDAS default = 500), see IDAS guide Sec.~4.5

Type:int

Range:\(\geq 0\)

Length:1

`MAX_STEP_SIZE`

Maximum size of timesteps taken by IDAS (optional, defaults to unlimited 0.0), see IDAS guide Sec.~4.5

Unit:\(\mathrm{s}\)

Type:double

Range:\(\geq 0\)

Length:1

`ERRORTEST_SENS`

Determines whether (forward) sensitivities take part in local error test (optional, defaults to 1)

Type:int

Range:\(\{0,1\}\)

Length:1

`MAX_NEWTON_ITER`

Maximum number of Newton iterations in time step (optional, defaults to 3)

Type:int

Range:\(\geq 0\)

Length:1

`MAX_ERRTEST_FAIL`

Maximum number of local error test failures in time step (optional, defaults to 7)

Type:int

Range:\(\geq 0\)

Length:1

`MAX_CONVTEST_FAIL`

Maximum number of Newton convergence test failures (optional, defaults to 10)

Type:int

Range:\(\geq 0\)

Length:1

`MAX_NEWTON_ITER_SENS`

Maximum number of Newton iterations in forward sensitivity time step (optional, defaults to 3)

Type:int

Range:\(\geq 0\)

Length:1

## Group /solver/sections¶

`NSEC`

Number of sections

Type:int

Range:\(\geq 1\)

Length:1

`SECTION_TIMES`

Simulation times at which the model changes or behaves discontinously; including start and end times

Unit:\(\mathrm{s}\)

Type:double

Range:\(\geq 0\)

Length:\(\texttt{NSEC}+1\)

`SECTION_CONTINUITY`

Continuity indicator for each section transition: 0 (discontinuous) or 1 (continuous).

Type:int

Range:\(\{0,1\}\)

Length:\(\texttt{NSEC}-1\)