Matlab Level 2 S-functions and Arrays

My Question is the following:

I want to write an S-Function which takes an n-dimensional input, and gives as output the same Array with an added collumn in a chosen dimension.

When I try that I always end up with errors about a missmatch of dimensions:

"Error in 'SetOutputPortDimensions' method of 'Test_simple/Level-2 MATLAB S-Function1'. The dimension of output port 0 should have been set to [4x1], but was instead set to [4x2]."

&

"Error in port widths or dimensions. Output port 1 of 'Test_simple/Constant' is a [4x1x2] matrix."

How can I fix this missmatch of dimensions?

My code: -----------------------------------------------------------------------------------------------------------------------------------------------------------------

function VPSFUNC4S(block)
setup(block);

function setup(block)
  block.NumInputPorts  = 1;
  block.NumOutputPorts = 1;
  block.AllowSignalsWithMoreThan2D = 1;

    block.SetPreCompInpPortInfoToDynamic;
    block.SetPreCompOutPortInfoToDynamic;

    block.InputPort(1).DirectFeedthrough = true;

    block.OutputPort(1).DimensionsMode = 'Variable';

    block.NumContStates = 1;
    block.SampleTimes = [0 0];
    block.SetAccelRunOnTLC(false);
    block.SimStateCompliance = 'DefaultSimState';
    block.RegBlockMethod('SetOutputPortDimensions', @SetOutPortDims);
    block.RegBlockMethod('Outputs', @Outputs);

function SetOutPortDims(block, idx, di)
    di=block.InputPort(1).Dimensions;
    di(2)=di(2)+1;
    block.OutputPort(idx).Dimensions = di;

    function Outputs(block)
    Grosse=size(block.InputPort(1).Data);
    X=Grosse(2);
    block.OutputPort(1).Data=block.InputPort(1).Data;
    block.OutputPort(1).Data=[block.OutputPort(1).Data,zeros(1,Grosse(1))];
  for k=1:4;
        block.OutputPort(1).Data(k,X+1,1)=block.InputPort(1).Data(k,X,:)+10;
  end

Answer 1

[Yves]

Found a solution: http://de.mathworks.com/matlabcentral/newsreader/view_thread/158035

[Richard Crozier]

Sadly the newsreader is dead and therefore so is this link. Can you share the solution agin?

[Yves]

I have no clue what it was, but I still have the code I wrote back then (which works as intended), so I hope this example gives you the information you seek.

function SF_FP(block)
setup(block);
  
function setup(block)
  block.NumDialogPrms     = 5;
  block.DialogPrmsTunable = {'Tunable','Tunable','Tunable','Tunable','Tunable'};
  
  block.NumInputPorts  = 1;
  block.NumOutputPorts = 2;
  block.AllowSignalsWithMoreThan2D = 1;
  
  block.SetPreCompInpPortInfoToDynamic;
  block.SetPreCompOutPortInfoToDynamic;
  
  block.InputPort(1).DirectFeedthrough = true;
  block.InputPort(1).DatatypeID   = 0;

  block.OutputPort(1).DatatypeID   = 0;
     
  block.SampleTimes = [0 0];
  block.NumContStates = 1;
  block.SetAccelRunOnTLC(false);
  block.SimStateCompliance = 'DefaultSimState';
  block.RegBlockMethod('SetInputPortSamplingMode', @SetInpPortFrameData);
  block.RegBlockMethod('SetInputPortDimensions', @SetInpPortDims);
  block.RegBlockMethod('Outputs', @Outputs);
 
  
function SetInpPortFrameData(block, idx, fd)
   
   block.InputPort(idx).SamplingMode = fd;
   block.OutputPort(1).SamplingMode  = fd;
   block.OutputPort(2).SamplingMode  = fd;

function SetInpPortDims(block, idx, di)
    block.InputPort(idx).Dimensions = di;
    di(2)=di(2)+1;
    block.OutputPort(1).Dimensions = di;
    block.OutputPort(2).Dimensions = di;
    

As far as I remember: this did the trick, I think setting the outputport dimension within

function SetInpPortDims(block, idx, di)

Was the solution, you gotta try it, I haven't done any coding in MATLAB since years.

You are really lucky I happen to be at the place were I made this again and got the same email I used to have back then otherwise you would have had no chance for an answer.

If you have closed loops you want to evaluate with your s-functions (example below) you have to evaluate the length of the closed loop in the init function of your s-function block. However as far as I rember I had troubels with properly setting init values using the init functions when blocks rely on data provided by other s-functions.

example:

source ->in_1 mixer -> some process -> split stuff out_1-> go on

^ in_2 | out_2

|_________________________|

You should also check:

block.RegBlockMethod('SetInputPortSamplingMode', @SetInpPortFrameData);

and

function SetInpPortFrameData(block, idx, fd)
   
   block.InputPort(idx).SamplingMode = fd;
   block.OutputPort(1).SamplingMode  = fd;
   block.OutputPort(2).SamplingMode  = fd;

I can't remember why I had to do that, but it might be connected to it.