Android Open Source - dice-probabilities Second Chance Special

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License

The source code is released under:

MIT License

Java Source Code

package org.kleemann.diceprobabilities.special;
/*from   ww w.jav a  2 s.  c  om*/
import org.apache.commons.math3.fraction.BigFraction;
import org.kleemann.diceprobabilities.R;
import org.kleemann.diceprobabilities.distribution.Distribution;
import org.kleemann.diceprobabilities.distribution.ScaleCumulativeDistribution;

import android.content.res.Resources;
import android.util.SparseIntArray;

/**
 * <p>
 * If the first roll fails you get a second chance to roll in order to succeed.
 */
class SecondChanceSpecial extends AbstractSpecial {

  public SecondChanceSpecial(Resources r) {
    super(r.getString(R.string.special_second_chance_title), r
        .getString(R.string.special_second_chance_description));
  }

  @Override
  public Distribution getDistribution(SparseIntArray sidesToCount) {
    Distribution d = super.getDistribution(sidesToCount);

    return ScaleCumulativeDistribution.scale(d,
        new ScaleCumulativeDistribution.Scale() {
          public BigFraction scale(BigFraction pS, int x) {
            // P(S) = 1 - P(F)
            // P(new) = P(S) + P(F) * P(S)
            final BigFraction pF = BigFraction.ONE.subtract(pS);
            return pS.add(pF.multiply(pS));
          }
        });
  }
}

Java Source Code List

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