setting Simulink data view tolerance progamatically

is it possible to to set the tolerance used by the SDI programatically? for example,assuming i have some .mat files called alldata_b, and alldata from separate simulink runs.

runID5 = Simulink.sdi.createRun('alldata_b','file','alldata_b');
runID6 = Simulink.sdi.createRun('alldata',  'file','alldata');
diffSDI_tmp = Simulink.sdi.compareRuns(runID5, runID6);
% Number of comparisons in result
cntSigCmp_tmp = diffSDI_tmp.count;

% Iterate through each result element
for i = 1:cntSigCmp_tmp
   % Get signal result at index i
   sigDiff_tmp = diffSDI_tmp.getResultByIndex(i);
   sigNam_tmp = Simulink.sdi.getSignal(i); % create the object first
   sigNam_tmp = sigNam_tmp.signalLabel; % get the object from the object
   sigDiff_tmp.tol = 1;
end

the line "sigDiff_tmp.tol = 1;" gives the following result:

You cannot set the read-only property 'tol' of DiffSignalResult.

Error in <my_script> (line X)
   sigDiff_tmp.tol = 1;

does this mean the only way to change the tolerance is by editing in the SDI? is there no way around this?

Answer 1

[Sriram Narayanan]

It is currently not possible to tune the signal comparison tolerance programmatically. However, one could specify the absolute and relative tolerance for each signal programmatically.

The following is a code snippet of how this can be achieved.

% Configure model "slexAircraftExample" for logging and simulate
simOut = sim('slexAircraftExample', 'SaveOutput','on', ...
               'SaveFormat', 'StructureWithTime', ...
               'ReturnWorkspaceOutputs', 'on');

% Create a Simulation Data Inspector run
[runID,runIndex,signalIDs] = Simulink.sdi.createRun('My Run', ...
        'base',{'simOut'});

% Get the Simulink.sdi.Run object corresponding to the new run ID
runObj = Simulink.sdi.getRun(runID);

% Get the number of signals in the run
numSignals = runObj.signalCount;

% Get the Simulink.sdi.Signal objects for each signal in the run
% Specify the absolute and relative tolerance for each signal
for i = 1:numSignals
   signalObjs(i) = runObj.getSignal(signalIDs(i));
   signalObjs(i).absTol = 0.5;
   signalObjs(i).relTol = 0.005;
end

[Albert Mathews]

Thank you Sriram Narayanan The answer above works for setting the tol values for a run. however, an additional note should be made that if the user wants to set the tol values for a SDI.compareRuns object, the tol values MUST be set for the first run argument, see below, otherwise setting tols for the second run argument does nothing.

      runID1 = Simulink.sdi.createRun(blah blah);
      [runID,runIndex,signalIDs] = Simulink.sdi.createRun(blah blah);

   % Get the Simulink.sdi.Run object corresponding to the new run ID
  runObj = Simulink.sdi.getRun(runID); 
   % Get the number of signals in the run
  numSignals = runObj.signalCount;
   % Get the Simulink.sdi.Signal objects for each signal in the run
   % Specify the absolute and relative tolerance for each signal
  for i = 1:numSignals;
     signalObjs(i) = runObj.getSignal(signalIDs(i));
     signalObjs(i).absTol = 1;
     signalObjs(i).relTol = 0.1;
  end    
      diffSDI_tmp = Simulink.sdi.compareRuns(runID, runID1, Simulink.sdi.AlignType.BlockPath);

note how the tols are set for runID, and NOT runID1. and how runID is the first run argument in Simulink.sdi.compareRuns

Answer 2

[William R]

But what is not answered in this post is how to set the time tolerance programmatically of a signal. This can be done manually in the SDi but if you store a Simulink.sdi.Signal to the workspace there is no timeTol property and you can also not add or edit this. If you try to add it the following error pops up:

No public property TimeTol exists for class Simulink.sdi.Signal.

Why is this not possible? Or is there another way to do this?