Writing S-Functions

ssSetSFcnParamTunable

Make a block parameter tunable.

Syntax

• void ssSetSFcnParamTunable(SimStruct *S, int_T param, 
  int_T isTunable)
  

Arguments

S
   SimStruct representing an S-Function block.

param
   Index of the parameter.

isTunable
   Valid values are 1 (tunable) or 0 (not tunable).

Description

Use this macro in mdlInitializeSizes to specify whether a user can change a dialog parameter during the simulation. The parameter index starts at 0 and is less than ssGetSFcnParamsCount(S). This improves efficiency and provides error handling in the event that an attempt is made to change the parameter.

Note    Dialog parameters are tunable by default. However, an S-function should declare the tunability of all parameters, whether tunable or not, to avoid programming errors. If the user enables the simulation diagnostic S-function upgrade needed, Simulink issues the diagnostic whenever it encounters an S-function that fails to specify the tunability of all its parameters.

Languages

C

See Also
ssGetSFcnParamsCount

ssSetSFcnParamNotTunable

ssSetSolverNeedsReset