Using the Monte Carlo analysis option of the Time Domain Toolbox, you can perform a predefined number of simulation runs with variation of parameter values according to a predefined distribution function.
1. | From the Getting Started Manual\Time Domain Toolbox library open the model ParameterSweep. |
2. | Open the Simulator. |
3. | From the Tools menu select the Time Domain Toolbox and then Monte Carlo Analysis. |
A window opens asking you which parameters / initial values should be varied for the Monte Carlo analysis:
Two parameters have already been entered.
4. | Click the Next button. |
A window opens asking you which result should be monitored during the Monte Carlo Analysis:
Here the integrated absolute error of the machine is chosen.
5. | Click the Next button. |
A window opens asking some simulation run options:
Because this is a statistical method, we have to do many simulations runs. We therefore choose not to display the results in a plot to speed up simulation and prevent using too much computer memory.
6. | Click the Next button. |
A window opens with a summary of the chosen options. If your are not satisfied you can use the Back button to go to a previous window and change settings.
7. | Click the Finish button to close the Multiple Run Wizard. |
8. | From the Simulation menu click the Multiple Run command to perform the Monte Carlo Analysis. |
After the simulations have been done, a Monte Carlo Analysis Results window will open, showing the results:
You can select the following items:
• | Values: Choose this button to open the list that shows the output of the various runs performed during the Monte Carlo analysis. |
• | Histogram: Choose this button to open a histogram of the selected item. |
• | Matlab: Export the results to Matlab. |
• | OK: Close the Multiple Run Results Window. |
You can always re-open the Multiple Run Results window, by selecting the Multiple Run Results command of the View Menu.
9. | By choosing the Values button, a new window is opened, showing output of the various runs performed during the Monte Carlo analysis. |
You can select the following items:
• | Set Values: Choose the values of the selected run, as new parameter values of your model. |
• | Create Datafile: Use this button to store the values of the selected variables on file. Use the control-key and shift-key to make multiple selections. |
By choosing the Histogram button, a new window is opened, showing distribution of the integrated absolute error: