RandomReal

RandomReal[]

gives a pseudorandom real number in the range 0 to 1.

RandomReal[{xmin,xmax}]

gives a pseudorandom real number in the range xmin to xmax.

RandomReal[xmax]

gives a pseudorandom real number in the range 0 to xmax.

RandomReal[range,n]

gives a list of n pseudorandom reals.

RandomReal[range,{n1,n2,}]

gives an n1×n2× array of pseudorandom reals.

Details and Options

  • RandomReal[{xmin,xmax}] chooses reals with a uniform probability distribution in the range xmin to xmax.
  • RandomReal[spec,WorkingPrecision->n] yields reals with n-digit precision. Leading or trailing digits in the generated number can turn out to be 0.
  • RandomReal gives a different sequence of pseudorandom reals whenever you run the Wolfram Language. You can start with a particular seed using SeedRandom.
  • A Method option to SeedRandom can be given to specify the pseudorandom generator used.

Examples

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Basic Examples  (6)

A random real number in the range 0 to 1:

A random real number in the range to :

A random real number in the range 0 to 10:

Five random reals in the range 0 to 1:

A 3×2 array of random reals in the range to :

Random coordinates for 4 points in 3 dimensions:

Scope  (3)

Generate random reals of any magnitude:

Generate random reals of any precision:

Generate low-precision reals:

Options  (1)

WorkingPrecision  (1)

Generate a random real with 50-digit precision:

Applications  (8)

A random walk:

Circles at random positions:

Random array of gray levels:

Spheres at random positions:

Two-dimensional random walk:

Three-dimensional random walk:

Determinants of random 100×100 matrices:

Generate a complex number in the unit square:

Generate 5 complex numbers:

Use RandomComplex instead:

Generate exponential random variables using inversion method:

Compare sample histogram with the PDF of ExponentialDistribution:

Alternatively, use RandomVariate to sample from nonuniform distributions directly:

Test whether both datasets could be samples from the same distribution:

Properties & Relations  (5)

Use SeedRandom to get repeatable random values:

Use BlockRandom to block one use of RandomReal from affecting others:

With the same seed, RandomReal generates the "same" number, regardless of precision:

RandomReal generates a uniform distribution, here with mean 0.5:

RandomReal generates white noise:

Neat Examples  (1)

Construct a surface from random heights:

Introduced in 2007
 (6.0)