Class UniformLongSampler
- java.lang.Object
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- org.apache.commons.rng.sampling.distribution.UniformLongSampler
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- All Implemented Interfaces:
LongSampler
,SharedStateLongSampler
,SharedStateSampler<SharedStateLongSampler>
public abstract class UniformLongSampler extends Object implements SharedStateLongSampler
Discrete uniform distribution sampler generating values of typelong
.Sampling uses
UniformRandomProvider.nextLong()
.When the range is a power of two the number of calls is 1 per sample. Otherwise a rejection algorithm is used to ensure uniformity. In the worst case scenario where the range spans half the range of a
long
(263 + 1) the expected number of calls is 2 per sample.- Since:
- 1.4
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Field Summary
Fields Modifier and Type Field Description protected UniformRandomProvider
rng
Underlying source of randomness.
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Method Summary
All Methods Static Methods Instance Methods Abstract Methods Concrete Methods Modifier and Type Method Description static UniformLongSampler
of(UniformRandomProvider rng, long lower, long upper)
Creates a new discrete uniform distribution sampler.String
toString()
abstract UniformLongSampler
withUniformRandomProvider(UniformRandomProvider rng)
Create a new instance of the sampler with the same underlying state using the given uniform random provider as the source of randomness.-
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
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Methods inherited from interface org.apache.commons.rng.sampling.distribution.LongSampler
sample, samples, samples
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Field Detail
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rng
protected final UniformRandomProvider rng
Underlying source of randomness.
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Method Detail
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withUniformRandomProvider
public abstract UniformLongSampler withUniformRandomProvider(UniformRandomProvider rng)
Create a new instance of the sampler with the same underlying state using the given uniform random provider as the source of randomness.- Specified by:
withUniformRandomProvider
in interfaceSharedStateSampler<SharedStateLongSampler>
- Parameters:
rng
- Generator of uniformly distributed random numbers.- Returns:
- the sampler
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of
public static UniformLongSampler of(UniformRandomProvider rng, long lower, long upper)
Creates a new discrete uniform distribution sampler.- Parameters:
rng
- Generator of uniformly distributed random numbers.lower
- Lower bound (inclusive) of the distribution.upper
- Upper bound (inclusive) of the distribution.- Returns:
- the sampler
- Throws:
IllegalArgumentException
- iflower > upper
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