More than one output for level-2 S-function

Question

upt0zer0 2012-11-20

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https://ww2.mathworks.cn/matlabcentral/answers/54276-more-than-one-output-for-level-2-s-function

评论： Michael Stich 2015-11-5

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Hi

i have the following problem. My Level-2 s-function needs a second output.

thats what i've done:

    if true
  % Register number of ports
  block.NumInputPorts  = 2; 
  block.NumOutputPorts = 1;
% Setup port properties to be inherited or dynamic
block.SetPreCompInpPortInfoToDynamic;
block.SetPreCompOutPortInfoToDynamic;
% Override input port properties
block.InputPort(1).Dimensions  = [10,1];
block.InputPort(1).DatatypeID  = 0;  % double
block.InputPort(1).Complexity  = 'Complex';
% Override output port properties
block.OutputPort(1).Dimensions  = [10,1];
block.OutputPort(1).DatatypeID  = 0; % double
block.OutputPort(1).Complexity  = 'Complex';
block.OutputPort(2).Dimensions  = [5,1];
block.OutputPort(2).DatatypeID  = 0; % double
block.OutputPort(2).Complexity  = 'Complex';
  end

when i start the simulation, always this pops out: "Level-2 MATLAB S-function 'Sync_fehlerkorrektur' in 'Gesamtmodell/Synchronisation' does not have a 'SetInputPortSamplingMode' method. When a Level-2 MATLAB S-function with multiple output ports has dynamic sampling mode setting for any of its ports, it is necessary to register a 'SetInputPortSamplingMode' method"

I searched for this "SetInputPortSamlingMode"-method, but i didn't find anything which helps me.

Can anybody help me? Short explanation and an example plz!

Thx

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Answer 1

Kaustubha Govind 2012-11-20

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https://ww2.mathworks.cn/matlabcentral/answers/54276-more-than-one-output-for-level-2-s-function#answer_65955

在 MATLAB Online 中打开

If need to have two output ports, shouldn't you have:

block.NumOutputPorts = 2; %you've set this to 1

Also, right after you set the output port complexities, also set their sampling mode as the error suggests:

   block.OutputPort(1).SamplingMode = 'Sample';
   block.OutputPort(2).SamplingMode = 'Sample';

You need to define a SetInputPortSamplingMode method only if you need the output SamplingMode to be inherited.

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Stev 2012-12-3

在 MATLAB Online 中打开

I have one more question to this topic. In my code i did the definition of the output port like you, but i get the same message like upt0zer0.

I need the OutputSamplingMode th be inherit, but i didn't find how to do this in the matlab help?

Here is my code :

function test(block)

setup(block);

function setup(block)

%%Register number of input and output ports
block.NumInputPorts  = 5;
block.NumOutputPorts = 2;
%%Setup functional port properties to dynamically
%%inherited.
block.SetPreCompInpPortInfoToDynamic;
block.SetPreCompOutPortInfoToDynamic;
block.InputPort(1).DirectFeedthrough = true;
%%Set block sample time to inherited
block.SampleTimes = [-1 0];
%%Set the block simStateCompliance to default (i.e., same as a built-in    block)
block.SimStateCompliance = 'DefaultSimState';
%%Run accelerator on TLC
block.SetAccelRunOnTLC(true);
%%Register methods
block.RegBlockMethod('Outputs',                 @Output);

%endfunction

function Output(block)

block.OutputPort(1).Data = block.InputPort(1).Data + block.InputPort(3).Data ;
block.OutputPort(2).Data = block.InputPort(2).Data + block.InputPort(4).Data + block.InputPort(5).Data ;

%endfunction

Kaustubha Govind 2012-12-27

Stev: If you'd like the output sampling mode to be inherited, you need to implement a SetInputPortSamplingMode method to specify where it's inherited from (you have 5 inputs). Please look at msfuntmpl.m for an example (can be located by typing "which msfuntmpl").

Michael Stich 2015-11-5

Thank you, this helped figure it out. Little sparse on the details however.

And, why is this SetInputPortSamplingMode method not anywhere to be found in the doc? If it is there I can't find it and I've tried multiple ways of looking. R2015b

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More than one output for level-2 S-function

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