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RandomSample

RandomSample
gives a pseudorandom sample of n of the .
RandomSample
gives a pseudorandom sample of n of the chosen using weights .
RandomSample
gives a pseudorandom permutation of the .
  • RandomSample gives a different sequence of pseudorandom choices whenever you run Mathematica. You can start with a particular seed using SeedRandom.
  • A Method option to SeedRandom can be given to specify the pseudorandom generator used.
Find a sample in which no elements ever occur more than once:
Generate a random permutation:
Find a sample in which no elements ever occur more than once:
In[1]:=
Click for copyable input
Out[1]=
 
Generate a random permutation:
In[1]:=
Click for copyable input
Out[1]=
The elements can be any expressions:
With larger weights for later elements, later elements tend to be selected for the sample:
Successively fill in black squares down the page:
Use SeedRandom to get repeatable random values:
Use BlockRandom to block one use of RandomSample from affecting others:
RandomSample of size 1 follows the same distribution as RandomChoice:
If the sample size is larger than the population size, an error message is returned:
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