jax.random.f#

jax.random.f(key, dfnum, dfden, shape=None, dtype=<class 'float'>)[source]#

Sample F-distribution random values with given shape and float dtype.

The values are distributed according to the probability density function:

\[f(x; \nu_1, \nu_2) \propto x^{\nu_1/2 - 1}\left(1 + \frac{\nu_1}{\nu_2}x\right)^{ -(\nu_1 + \nu_2) / 2}\]

on the domain \(0 < x < \infty\). Here \(\nu_1\) is the degrees of freedom of the numerator (dfnum), and \(\nu_2\) is the degrees of freedom of the denominator (dfden).

Parameters:

  • key (ArrayLike) – a PRNG key used as the random key.

  • dfnum (RealArray) – a float or array of floats broadcast-compatible with shape representing the numerator’s df of the distribution.

  • dfden (RealArray) – a float or array of floats broadcast-compatible with shape representing the denominator’s df of the distribution.

  • shape (Shape | None | None) – optional, a tuple of nonnegative integers specifying the result shape. Must be broadcast-compatible with dfnum and dfden. The default (None) produces a result shape equal to dfnum.shape, and dfden.shape.

  • dtype (DTypeLikeFloat) – optional, a float dtype for the returned values (default float64 if jax_enable_x64 is true, otherwise float32).

Returns:

A random array with the specified dtype and with shape given by shape if shape is not None, or else by df.shape.

Return type:

Array