You do not need to "understand" this. |
It is useful to check random number generator. |
Is xn+i independent of xn for different values of i= 1...? |
Also, note one must specify a "seed" = initial value x0 |
Then "random numbers" follow deterministically. |
x0 => x1 => x2 ...... |
Set seed (x0) from "Time of Day" |
Save seed so can rerun program.. |