Set the dimensions of the signals accepted by an input port
SetInputPortDimensions(s, port, dimsInfo)
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
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.
This method can set the dimensions of any other input or output
port whose dimensions derive from the dimensions of
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.