Many design algorithms (for example, DOE techniques) use random numbers to generate parameter values (or combinations of parameter values) to use when searching the design space. If you run a simulation process with one of these design algorithms and run it a second time, you will not get the same results (though you will often get near the same solution, but through a different path). If you want the simulation process execution to follow a consistently repeatable path, you must set a fixed seed for the random number generator to use when it provides random numbers (otherwise, it often uses something like the current time in milliseconds). With a fixed seed, the random number generator always produces the same sequence of random numbers. | |||||||||