Matlab Level 2 S-functions and Arrays

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Yves
Yves 2015-2-17
编辑： Yves 2020-2-26
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

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Yves
Yves 2015-2-17
  2 个评论
Richard Crozier
Richard Crozier 2020-2-17
编辑：Richard Crozier 2020-2-17
Sadly the newsreader is dead and therefore so is this link. Can you share the solution agin?
Yves
Yves 2020-2-26
编辑：Yves 2020-2-26
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.

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