LogicAnalyser - Variable Number of inputs

When using the DSP logic analyser the step method expects to receive N inputs where N is equal to the number of input ports specified when instanciating the scope

scope = dsp.LogicAnalyzer('NumInputPorts',3);

I'm trying create a script to plot data from the output of a Simulink model where there can be any number of inputs. The output from the simulink model is a "Stucture with Time" named yout.

data = [yout.signals.values]

Gives me the data i need, i can access each step by iterating though each row of data but I don't know how to pass all N signals for a single time step to the LogicAnalyzer object. data contains logical values.

Is there a method to pass the logic analyzer a variable number of data points? Perhaps as a vector?

The only solution I have come up with is to use eval to execute the step command with a string I create that contains 'data(t,1), data(t,2)... '

Answer 1

[Bharath Venkataraman]

Please take a look at the file analyzeLogicFromSimulink to see how to pass in the entire set of data at one go. This function creates and plots all the logged data from a Simulink simulation.

[Scott]

Thanks Bharath. Changing the format of the logged data to 'Dataset' and changing the solver to fixed step allowed me to use the analyzeLogicFromSimulink function. I just need to modify it to name the channels with the output block name.

[Scott]

A slight improvement to add the output block names to the signals on the logic analyser.

function scope = LogicAnalyzerSignalNames(dataset)
% LogicAnalyserSignalNames
%
  scope = analyzeLogicFromSimulink(dataset);

    numElements = dataset.numElements;
    for ii = 1:numElements
       blkName = dataset.getElement(ii).BlockPath.getBlock(1);
       scope.modifyDisplayChannel(ii,'Name',blkName);
    end
end

[Bharath Venkataraman]

Glad it helped!