How do I concatenate my output data from multiple simulations of my model?

Prashant Kumar answered . 2024-11-05 19:25:53

The solution to this involves the monte carlo capabilities available using the command line with your Simulink model and the use of the VERTCAT function to concatenate the data after each run. The following example code uses the vdp demo model to demonstrate. For more information on the VERTCAT function, please type the following at the MATLAB command window prompt:

help vertcat

PLEASE NOTE: You first need to edit the vdp model by going to the Simulation menu and choosing Simulation Parameters-->Workspace I/O pane. Then check the Time and Output boxes.

% Initialize start and stop time as well as the time and output

start      = 0;

stop      = 10;

time      = [];

output  = [];

for i = 1:10

    % Simulate the model and save the data by concatenating it

    [t,state,y] = sim('test_vdp',[start stop]);

    start  = stop;

    stop   = stop + 10;

    % Concatenate the previous data with the new data

    % This will cause the end point to overlap (repeat), but is harmless

    % as you can tell from the results (data is the same)

    time   = vertcat(time,t);

    output = vertcat(output,y);

end

plot(time,output)

% Clear the data from the script

clear i start stop t y state

For more information on running a simulation from the command line, please refer to the Simulink documentation opened when you enter the following command at the MATLAB command prompt:

web([docroot,'/toolbox/simulink/ug/simulation28.html'])

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