private FrequentDirections()

in src/main/java/org/apache/datasketches/vector/decomposition/FrequentDirections.java [155:181]

• 22 lines of code
• 5 McCabe index (conditional complexity)

  private FrequentDirections(final int k, final int d, final Matrix B, final MatrixType type) {
    if (k < 1) {
      throw new IllegalArgumentException("Number of projected dimensions must be at least 1");
    }
    if (d < 1) {
      throw new IllegalArgumentException("Number of feature dimensions must be at least 1");
    }

    k_ = k;
    l_ = 2 * k;
    d_ = d;

    if (d_ < l_) {
      throw new IllegalArgumentException("Running with d < 2k not yet supported");
    }

    svAdjustment_ = 0.0;

    nextZeroRow_ = 0;
    n_ = 0;

    if (B == null) {
      B_ = new MatrixBuilder().setType(type).build(l_, d_);
    } else {
      B_ = B;
    }
  }