Why do I receive an "Error in port widths or dimensions" error when I set default input dimensions in Simulink when the input ports are initialized dynamically?

I have created a Level-2 MATLAB file S-function. I have two inputs. One of the inputs is a vector and the other input is a matrix. I use the following code to initialize the dimensions of my inputs:

block.SetPreCompInpPortInfoToDynamic;

By doing this, I receive the following error: ERROR: Error in port widths or dimensions.

Answer 1

[MathWorks Support Team]

In order to use several ports which inherit their dimensions from the input ports, you can use the SetInpPortDims method as follows

block.RegBlockMethod('SetInputPortDimensions',  @SetInpPortDims); 

function SetInpPortDims(Block, port, dims) 
   Block.InputPort(port).Dimensions = dims;

 The attached example illustrates this.