Package org.apache.commons.rng.sampling.shape

Class LineSampler

java.lang.Object

org.apache.commons.rng.sampling.shape.LineSampler

All Implemented Interfaces:

ObjectSampler<double[]>, SharedStateObjectSampler<double[]>, SharedStateSampler<SharedStateObjectSampler<double[]>>

public abstract class LineSampler
extends Object
implements SharedStateObjectSampler<double[]>

Generate points uniformly distributed on a line.

Sampling uses:

• UniformRandomProvider.nextDouble()

Since:

1.4

Method Summary

Modifier and Type	Method	Description
protected abstract double[]	createSample(double p1mu, double u)	Creates the sample given the random variate u in the interval [0, 1].
static LineSampler	of(UniformRandomProvider rng, double[] a, double[] b)	Create a line sampler with vertices a and b.
double[]	sample()	Create a sample.
abstract LineSampler	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, toString, wait, wait, wait

Method Detail

sample

public double[] sample()

Description copied from interface: ObjectSampler

Create a sample.

Specified by:

sample in interface ObjectSampler<double[]>

Returns:

a random Cartesian coordinate on the line.

createSample

protected abstract double[] createSample(double p1mu,
                                         double u)

Creates the sample given the random variate u in the interval [0, 1]. The sum 1 - u is provided. The sample can be obtained from the line ab using:

 p = a(1 - u) + ub
 

Parameters:

p1mu - plus 1 minus u (1 - u)

u - the variate u

Returns:

the sample

withUniformRandomProvider

public abstract LineSampler 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 interface SharedStateSampler<SharedStateObjectSampler<double[]>>

Parameters:

rng - Generator of uniformly distributed random numbers.

Returns:

the sampler

of

public static LineSampler of(UniformRandomProvider rng,
                             double[] a,
                             double[] b)

Create a line sampler with vertices a and b. Sampled points are uniformly distributed on the line segment ab.

Sampling is supported in dimensions of 1 or above.

Parameters:

rng - Source of randomness.

a - The first vertex.

b - The second vertex.

Returns:

the sampler

Throws:

IllegalArgumentException - If the vertices do not have the same dimension; the dimension is less than 1; or vertices have non-finite coordinates.