Monte Carlo simulation is a way of seeing how a system will perform with added noise. If the noise you are interested in adding is normal or uniform noise, you can implement a Monte Carlo simulation with MATLAB only. However, if you would like to use a different type of noise, you would need to use the Statistics Toolbox.
The Statistics Toolbox offers twenty different types of random number generators. Also, the random number generators in the Statistics Toolbox allow you to specify the control parameters of the random numbers. You cannot specify parameters in RAND and RANDN, which are the random number generator functions that come in MATLAB.
