# 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();
let v = d.sample(&mut rand::thread_rng());
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
Deserialize this value from the given Serde deserializer. 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 `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason. Read more
Serialize this value into the given Serde serializer. Read more

## 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.