Set the dimensions of the signals accepted by an input port
SetInputPortDimensions(s, port, dimsInfo)
Instance of Simulink.MSFcnRunTimeBlock class representing the Level-2 MATLAB S-Function block.
Integer value specifying index of port to be set.
Array that specifies the signal dimensions supported by the port, e.g.,  for a 5-element vector signal or [3 3] for a 3-by-3 matrix signal.
The Simulink® engine calls this method during dimension propagation with candidate dimensions dimsInfo for port.
A Level-2 MATLAB S-function sets the input port dimensions using the line
s.InputPort(port).Dimensions = dimsInfo;
This method is only valid for simulation.
Note This method can set the dimensions of any other input or output port whose dimensions derive from the dimensions of port.
By default, the engine calls this method only if it can fully determine the dimensionality of port from the port to which it is connected.
The engine calls this method until all input ports with inherited dimensions have their dimensions specified.