Examples of RandomSamplingAssistant

cern.jet.random.sampling.RandomSamplingAssistant
Conveniently computes a stable Simple Random Sample Without Replacement (SRSWOR) subsequence of n elements from a given input sequence of N elements; Example: Computing a sublist of n=3 random elements from a list (1,...,50) may yield the sublist (7,13,47). The subsequence is guaranteed to be stable, i.e. elements never change position relative to each other. Each element from the N elements has the same probability to be included in the n chosen elements. This class is a convenience adapter for RandomSampler using blocks. @see RandomSampler @author wolfgang.hoschek@cern.ch @version 1.0, 02/05/99
org.apache.mahout.math.jet.random.sampling.RandomSamplingAssistant
@deprecated until unit tests are in place. Until this time, this class/interface is unsupported.

Examples of cern.jet.random.sampling.RandomSamplingAssistant


  if (this.samplingRate <= 1.0) {
    this.samplingAssistant = null;
  }
  else {
    this.samplingAssistant = new RandomSamplingAssistant(Arithmetic.floor(N/samplingRate), N, generator);
  }
  
  setUp(b,k);
  this.clear();
}

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Examples of cern.jet.random.sampling.RandomSamplingAssistant

/**
 * @param infinities the number of infinities to fill.
 * @param buffer the buffer into which the infinities shall be filled.
 */
protected void addInfinities(int missingInfinities,  DoubleBuffer buffer) {
  RandomSamplingAssistant oldAssistant = this.samplingAssistant;
  this.samplingAssistant = null; // switch off sampler
  //double[] infinities = new double[missingInfinities];
  
  boolean even=true;
  for (int i=0; i<missingInfinities; i++) {

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Examples of cern.jet.random.sampling.RandomSamplingAssistant

  super.clear();
  this.beta=1.0;
  this.weHadMoreThanOneEmptyBuffer = false;
  //this.setSamplingRate(samplingRate,N);


  RandomSamplingAssistant assist = this.samplingAssistant;
  if (assist != null) {
    this.samplingAssistant = new RandomSamplingAssistant(Arithmetic.floor(N/samplingRate), N, assist.getRandomGenerator());
  }
}

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Examples of cern.jet.random.sampling.RandomSamplingAssistant


  if (this.samplingRate <= 1.0) {
    this.samplingAssistant = null;
  }
  else {
    this.samplingAssistant = new RandomSamplingAssistant(Arithmetic.floor(N / samplingRate), N, generator);
  }
  
  setUp(b,k);
  this.clear();
}

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Examples of cern.jet.random.sampling.RandomSamplingAssistant

/**
 * @param infinities the number of infinities to fill.
 * @param buffer the buffer into which the infinities shall be filled.
 */
protected void addInfinities(int missingInfinities,  DoubleBuffer buffer) {
  RandomSamplingAssistant oldAssistant = this.samplingAssistant;
  this.samplingAssistant = null; // switch off sampler
  //double[] infinities = new double[missingInfinities];
  
  boolean even=true;
  for (int i=0; i<missingInfinities; i++) {

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Examples of cern.jet.random.sampling.RandomSamplingAssistant

  super.clear();
  this.beta=1.0;
  this.weHadMoreThanOneEmptyBuffer = false;
  //this.setSamplingRate(samplingRate,N);


  RandomSamplingAssistant assist = this.samplingAssistant;
  if (assist != null) {
    this.samplingAssistant = new RandomSamplingAssistant(Arithmetic.floor(N / samplingRate), N, assist.getRandomGenerator());
  }
}

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Examples of org.apache.mahout.math.jet.random.sampling.RandomSamplingAssistant

    this.N = N;


    if (this.samplingRate <= 1.0) {
      this.samplingAssistant = null;
    } else {
      this.samplingAssistant = new RandomSamplingAssistant(Arithmetic.floor(N / samplingRate), N, generator);
    }


    setUp(b, k);
    this.clear();
  }

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Examples of org.apache.mahout.math.jet.random.sampling.RandomSamplingAssistant

  /**
   * @param missingInfinities the number of infinities to fill.
   * @param buffer            the buffer into which the infinities shall be filled.
   */
  protected void addInfinities(int missingInfinities, DoubleBuffer buffer) {
    RandomSamplingAssistant oldAssistant = this.samplingAssistant;
    this.samplingAssistant = null; // switch off sampler
    //double[] infinities = new double[missingInfinities];


    boolean even = true;
    for (int i = 0; i < missingInfinities; i++) {

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Examples of org.apache.mahout.math.jet.random.sampling.RandomSamplingAssistant

    super.clear();
    this.beta = 1.0;
    this.weHadMoreThanOneEmptyBuffer = false;
    //this.setSamplingRate(samplingRate,N);


    RandomSamplingAssistant assist = this.samplingAssistant;
    if (assist != null) {
      this.samplingAssistant =
          new RandomSamplingAssistant(Arithmetic.floor(N / samplingRate), N, assist.getRandomGenerator());
    }
  }

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Examples of org.apache.mahout.math.jet.random.sampling.RandomSamplingAssistant

    int n = (int) Math.round(size * nonZeroFraction);
    if (n == 0) {
      return matrix;
    }


    RandomSamplingAssistant sampler =
        new RandomSamplingAssistant(n, size,
            new MersenneTwister());
    for (int i = 0; i < size; i++) {
      if (sampler.sampleNextElement()) {
        int row = i / columns;
        int column = i % columns;
        matrix.set(row, column, value);
      }
    }

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