Thread Subject:

Level 2 Matlab S-Function

I have a very simple simulink model which uses S-function to output a 2x2 matrix to display block. The matrix is initialized in matlab workspace, and it is input to the s-function through dialog parameter. The input to this s-function block is just the constant block with value of 1. It gives me an error message "Error in 'SetOutputPortDimensions' method of ...... The dimensions of output port 0 should have been set to [1], but was instead set to [2x2]"

I tried many different ways, but I cant get this to work. Thanks.

My code is below:
function test4(block)
setup(block);

function setup(block)
block.NumInputPorts = 1;
block.NumOutputPorts = 1;
block.SetPreCompInpPortInfoToDynamic;
block.SetPreCompOutPortInfoToDynamic;
block.InputPort(1).DatatypeID = 0; % double
block.InputPort(1).Complexity = 'Real';
block.OutputPort(1).DatatypeID = 0; % double
block.OutputPort(1).Complexity = 'Real';
block.NumDialogPrms = 1;
block.SampleTimes = [-1 0];
block.SimStateCompliance = 'DefaultSimState';
block.RegBlockMethod('SetInputPortSamplingMode', @SetInpPortFrameData);
block.RegBlockMethod('SetInputPortDimensions', @SetInpPortDims);
block.RegBlockMethod('SetOutputPortDimensions', @SetOutPortDims);
block.RegBlockMethod('Outputs', @Outputs);

function SetInpPortFrameData(block, idx, fd)
  block.InputPort(1).SamplingMode = fd;
  block.OutputPort(1).SamplingMode = fd;

function SetInpPortDims(block, idx, fd)
  block.InputPort(1).Dimensions = 1;

function SetOutPortDims(block, idx, fd)
  block.OutputPort(1).Dimensions = [2 2];

function Outputs(block)
a=block.DialogPrm(1).Data;
block.OutputPort(1).Data = a;

Do you need dynamic port sizing?
If not, the following works,

%%%%%%%%%%%%%%%%cute here %%%%%%%%%%%
function test4(block)
setup(block);

function setup(block)
block.NumInputPorts = 1;
block.NumOutputPorts = 1;
block.InputPort(1).DatatypeID = 0; % double
block.InputPort(1).Complexity = 'Real';
block.InputPort(1).Dimensions = 1;
block.OutputPort(1).DatatypeID = 0; % double
block.OutputPort(1).Complexity = 'Real';
block.OutputPort(1).Dimensions = [2 2];
block.NumDialogPrms = 1;
block.SampleTimes = [-1 0];
block.SimStateCompliance = 'DefaultSimState';
block.RegBlockMethod('Outputs', @Outputs);

function Outputs(block)
a=block.DialogPrm(1).Data;
block.OutputPort(1).Data = a;
%%%%%%%%%%%%%%%%cute here %%%%%%%%%%%

Hi Phil,

What if the case was for dynamically setting the Dwork.Dimensions. My Dwork Vector's dimension depends on the values that comes from an input port.

I've tried the following and didn't work:
function DoPostPropSetup(block)
% Dwrok vector set-up
block.NumDworks = 1;
% Completed_T_ID.
block.Dwork(1).Name = 'Completed_T_ID';
block.Dwork(1).Dimensions = block.InputPort(3).Data;
block.Dwork(1).DatatypeID = 0; % double
block.Dwork(1).Complexity = 'Real'; % real
block.Dwork(1).UsedAsDiscState = true;

Any suggestions? Thanks.