MATLAB: How to load Simulink objects into MATLAB on another machine

extractsimulink

I have saved signal logging data generated by Simulink into a .MAT file. I would like to load this data into MATLAB on another machine which does not have Simulink installed, however, the data is imported as a single cell instead of the structure that I expected. In addition, I receive the following message:

 "Warning: Variable 'variablename' originally saved as a Simulink.ModelDataLogs cannot be instantiated as an object and will be read in as a cell."

Best Answer

In order to read the data generated by Simulink on a machine that has a copy of MATLAB which does not have Simulink installed, you can convert the Simulink.ModelDataLogs object into a standard MATLAB structure. The GET command can be used to extract the properties or fields of the Simulink.ModelDataLogs object. The attached test.mat file contains some sample signal logging data. The following example illustrates how to save this data into a structure that can be imported into MATLAB.

clear
load test.mat
a = get(logsout);
f = fields(a);
b.Name = a.Name;
b.BlockPath = a.BlockPath;
for i = 3:numel(f)
      newfieldname = f{i}(isstrprop(f{i}, 'alphanum')); %remove characters that are invalid in a fieldname
      b.(newfieldname) = get(a.(f{i}));
      b.(newfieldname).TimeInfo  = get(b.(newfieldname).TimeInfo);
end

Related Solutions

MATLAB: How to convert signal logging data from Simulink (e.g. logsout data) to create single arrays with the according signal names in the workspace

Use the small script below to disassemble the signals and to get a single array for each logged signal (line) with the according name.

Note: This script only works for single dimension outputs. This script does NOT work for vectors like bus or mux signals.

%%Export logsout data to single arrays
a = get(logsout); 
f = fields(a); 
b.Name = a.Name; 
b.BlockPath = a.BlockPath; 
for i = 3:numel(f) 
      newfieldname = f{i}(isstrprop(f{i}, 'alphanum')); %remove characters that are invalid in a fieldname 
      b.(newfieldname) = get(a.(f{i})); 
      b.(newfieldname).TimeInfo  = get(b.(newfieldname).TimeInfo);
      outputstring = [newfieldname '= b.(newfieldname).Data'];
      eval(outputstring);
end
% OPTIONAL:
% delete obsolete data
clear a b f i newfieldname outputstring

MATLAB: How to access the workspace outputs like Logged Signals, States, Outputs or Inputs when I use the SIM function in Simulink 7.9(R2012a)

To access the signal logged to the workspace, refer to the following code .

>> simout =sim('vdp_signallogged','SignalLogging','on','SignalLoggingName','logsout_test')
>> simout.get('logsout_test') % To access the logged signal 'x2'
Simulink.ModelDataLogs (vdp_signallogged):
    Name                   Elements  Simulink Class
    x2                        1      Timeseries
>> simout.get('logsout_test').x2 % To access the properties of 'x2'
       Name: 'x2'
       BlockPath: 'vdp_signallogged/x2'
       PortIndex: 1
       SignalName: 'x2'
       ParentName: 'x2'
       TimeInfo: [1x1 Simulink.TimeInfo]
       Time: [64x1 double]
       Data: [64x1 double]

Best Answer

Related Solutions

MATLAB: How to convert signal logging data from Simulink (e.g. logsout data) to create single arrays with the according signal names in the workspace

MATLAB: How to access the workspace outputs like Logged Signals, States, Outputs or Inputs when I use the SIM function in Simulink 7.9(R2012a)

Related Question