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# Parameter Sensitivities¶

## Group /input/sensitivity¶

`NSENS`

Number of sensitivities to be computed

Type:int

Range:\(\geq 0\)

Length:1

`SENS_METHOD`

Method used for computation of sensitivities (algorithmic differentiation)

Type:string

Range:\(\texttt{ad1}\)

Length:1

## Group /input/sensitivity/param_XXX¶

`SENS_UNIT`

Unit operation index

Type:int

Range:\(\geq 0\)

Length:\(\geq 1\)

`SENS_NAME`

Name of the parameter (Note that

`PAR_RADIUS`

and`PAR_CORE_RADIUS`

sensitivities are only available for Finite Volume discretization)

Type:string

Length:\(\geq 1\)

`SENS_COMP`

Component index (\(-1\) if parameter is independent of components)

Type:int

Range:\(\geq -1\)

Length:\(\geq 1\)

`SENS_PARTYPE`

Particle type index (\(-1\) if parameter is independent of particle types)

Type:int

Range:\(\geq -1\)

Length:\(\geq 1\)

`SENS_REACTION`

Reaction index (\(-1\) if parameter is independent of reactions)

Type:int

Range:\(\geq -1\)

Length:\(\geq 1\)

`SENS_BOUNDPHASE`

Bound phase index (\(-1\) if parameter is independent of bound phases)

Type:int

Range:\(\geq -1\)

Length:\(\geq 1\)

`SENS_SECTION`

Section index (\(-1\) if parameter is independent of sections)

Type:int

Range:\(\geq -1\)

Length:\(\geq 1\)

`SENS_ABSTOL`

Absolute tolerance used in the computation of the sensitivities (optional). Rule of thumb: \(\texttt{ABSTOL} / \texttt{PARAM_VALUE}\)

Type:double

Range:\(\geq 0.0\)

Length:\(\geq 1\)

`SENS_FACTOR`

Linear factor of the combined sensitivity (optional, taken as \(1.0\) if left out)

Type:double

Range:\(\mathbb{R}\)

Length:\(\geq 1\)