Writing S-Functions

Masked Multiport S-Functions

If you are developing masked multiport S-function blocks whose number of ports varies based on some parameter, and if you want to place them in a Simulink library, you must specify that the mask modifies the appearance of the block. To do this, execute the command

•   set_param('block','MaskSelfModifiable','on')
  

at the MATLAB prompt before saving the library. Failure to specify that the mask modifies the appearance of the block means that an instance of the block in a model reverts to the number of ports in the library whenever you load the model or update the library link.

Scalar Expansion of Inputs

Custom Data Types