] resets the pseudorandom number generator, using the integer n as a seed.
] resets the generator, using as a seed the time of day.
You can use SeedRandom[
] to make sure you get the same sequence of pseudorandom numbers on different occasions.
You can also use SeedRandom["
"], although the seed set in this way may be different on different computer systems.
See the Mathematica book: Section 3.2.3.
See also: Random, $RandomState.
This seeds the random number generator.
Here is a list of 4 random numbers between 0 and 1.
After reseeding the random number generator, you get the same sequence of random numbers.
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