Randomization measure in rand
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What is the randomization power in rand function.? For example UNIX drand48 can generate a randomization of 2^48 (~10^14).
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Walter Roberson
2013-10-18
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2^53 different possibilities.
You should also be caring about how long the period is (that is, the time until the sequence repeats.) It is on the order of 2^11000 for the default randomization routine.
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Sandeep Ganji
2013-10-18
Shashank Prasanna
2013-10-18
rng('shuffle') just resets the seed of the RNG based on the current time on your machine. Doesn't do anything to the algorithm itself.
Walter Roberson
2013-10-18
编辑：Walter Roberson
2013-10-18
If your thought is to periodically have your program use rng('shuffle') in order to "improve the randomness", then interestingly it can be shown that this will reduce the randomness, because the times used as input to the shuffling will end up being correlated.
If you need "cryptographic strength" randomness, then you need to use special routines for that purpose that are "hardened" to reduce leakage of information about the internal state of the generator.
Sandeep Ganji
2013-10-18
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