# Struct rand::distributions::Bernoulli

``pub struct Bernoulli { /* private fields */ }``
Expand description

The Bernoulli distribution.

This is a special case of the Binomial distribution where `n = 1`.

## Example

``````use rand::distributions::{Bernoulli, Distribution};

let d = Bernoulli::new(0.3).unwrap();
println!("{} is from a Bernoulli distribution", v);``````

## Precision

This `Bernoulli` distribution uses 64 bits from the RNG (a `u64`), so only probabilities that are multiples of 2-64 can be represented.

## Implementations

Construct a new `Bernoulli` with the given probability of success `p`.

##### Precision

For `p = 1.0`, the resulting distribution will always generate true. For `p = 0.0`, the resulting distribution will always generate false.

This method is accurate for any input `p` in the range `[0, 1]` which is a multiple of 2-64. (Note that not all multiples of 2-64 in `[0, 1]` can be represented as a `f64`.)

Construct a new `Bernoulli` with the probability of success of `numerator`-in-`denominator`. I.e. `new_ratio(2, 3)` will return a `Bernoulli` with a 2-in-3 chance, or about 67%, of returning `true`.

return `true`. If `numerator == 0` it will always return `false`. For `numerator > denominator` and `denominator == 0`, this returns an error. Otherwise, for `numerator == denominator`, samples are always true; for `numerator == 0` samples are always false.

## Trait Implementations

Returns a copy of the value. Read more

Performs copy-assignment from `source`. Read more

Formats the value using the given formatter. Read more

Generate a random value of `T`, using `rng` as the source of randomness.

Create an iterator that generates random values of `T`, using `rng` as the source of randomness. Read more

Create a distribution of values of ‘S’ by mapping the output of `Self` through the closure `F` Read more

This method tests for `self` and `other` values to be equal, and is used by `==`. Read more

This method tests for `!=`.

## Blanket Implementations

Gets the `TypeId` of `self`. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls `U::from(self)`.

That is, this conversion is whatever the implementation of `From<T> for U` chooses to do.

The resulting type after obtaining ownership.

Creates owned data from borrowed data, usually by cloning. Read more

Uses borrowed data to replace owned data, usually by cloning. Read more

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.