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MATH-1158. 

Method "createSampler" overridden in "ParetoDistribution".
This commit is contained in:
Gilles 2016-03-12 02:38:42 +01:00
parent 82f4ce516c
commit 228b49fe2a
1 changed files with 17 additions and 0 deletions
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17
src/main/java/org/apache/commons/math4/distribution/ParetoDistribution.java
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@ -21,6 +21,7 @@ import org.apache.commons.math4.exception.NotStrictlyPositiveException;
import org.apache.commons.math4.exception.util.LocalizedFormats;
import org.apache.commons.math4.random.RandomGenerator;
import org.apache.commons.math4.random.Well19937c;
import org.apache.commons.math4.rng.UniformRandomProvider;
import org.apache.commons.math4.util.FastMath;
/**
@ -117,6 +118,7 @@ public class ParetoDistribution extends AbstractRealDistribution {
* @param shape Shape parameter of this distribution.
* @throws NotStrictlyPositiveException if {@code scale <= 0} or {@code shape <= 0}.
*/
@Deprecated
public ParetoDistribution(RandomGenerator rng, double scale, double shape)
throws NotStrictlyPositiveException {
this(rng, scale, shape, DEFAULT_INVERSE_ABSOLUTE_ACCURACY);
@ -131,6 +133,7 @@ public class ParetoDistribution extends AbstractRealDistribution {
* @param inverseCumAccuracy Inverse cumulative probability accuracy.
* @throws NotStrictlyPositiveException if {@code scale <= 0} or {@code shape <= 0}.
*/
@Deprecated
public ParetoDistribution(RandomGenerator rng,
double scale,
double shape,
@ -295,8 +298,22 @@ public class ParetoDistribution extends AbstractRealDistribution {
/** {@inheritDoc} */
@Override
@Deprecated
public double sample() {
final double n = random.nextDouble();
return scale / FastMath.pow(n, 1 / shape);
}
/** {@inheritDoc} */
@Override
public RealDistribution.Sampler createSampler(final UniformRandomProvider rng) {
return new RealDistribution.Sampler() {
/** {@inheritDoc} */
@Override
public double sample() {
final double n = rng.nextDouble();
return scale / FastMath.pow(n, 1 / shape);
}
};
}
}