Examples of org.apache.mahout.math.matrix.DoubleMatrix2D

org.apache.mahout.math.matrix.DoubleMatrix2D
@deprecated until unit tests are in place. Until this time, this class/interface is unsupported.

  @Override
  public DoubleMatrix2D viewRowFlip() {
    if (rows == 0) {
      return this;
    }
    DoubleMatrix2D view = new WrapperDoubleMatrix2D(this) {
      @Override
      public double getQuick(int row, int column) {
        return content.get(rows - 1 - row, column);
      }

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    checkRowIndexes(rowIndexes);
    checkColumnIndexes(columnIndexes);
    final int[] rix = rowIndexes;
    final int[] cix = columnIndexes;


    DoubleMatrix2D view = new WrapperDoubleMatrix2D(this) {
      @Override
      public double getQuick(int i, int j) {
        return content.get(rix[i], cix[j]);
      }

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  @Override
  public DoubleMatrix2D viewStrides(final int theRowStride, final int theColumnStride) {
    if (theRowStride <= 0 || theColumnStride <= 0) {
      throw new IndexOutOfBoundsException("illegal stride");
    }
    DoubleMatrix2D view = new WrapperDoubleMatrix2D(this) {
      @Override
      public double getQuick(int row, int column) {
        return content.get(theRowStride * row, theColumnStride * column);
      }

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    this.elements = new double[rows * columns];
  }


  /** Constructs an identity matrix (having ones on the diagonal and zeros elsewhere). */
  public static DoubleMatrix2D identity(int rowsAndColumns) {
    DoubleMatrix2D matrix = new DenseDoubleMatrix2D(rowsAndColumns, rowsAndColumns);
    for (int i = rowsAndColumns; --i >= 0;) {
      matrix.setQuick(i, i, 1);
    }
    return matrix;
  }

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      System.arraycopy(other.elements, 0, this.elements, 0, this.elements.length);
      return this;
    }


    if (haveSharedCells(other)) {
      DoubleMatrix2D c = other.copy();
      if (!(c instanceof DenseDoubleMatrix2D)) { // should not happen
        return super.assign(other);
      }
      other = (DenseDoubleMatrix2D) c;
    }

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    log.info("Lanczos iteration complete - now to diagonalize the tri-diagonal auxiliary matrix.");
    // at this point, have tridiag all filled out, and basis is all filled out, and orthonormalized
    EigenvalueDecomposition decomp = new EigenvalueDecomposition(triDiag);


    DoubleMatrix2D eigenVects = decomp.getV();
    DoubleMatrix1D eigenVals = decomp.getRealEigenvalues();
    endTime(TimingSection.TRIDIAG_DECOMP);
    startTime(TimingSection.FINAL_EIGEN_CREATE);
    for (int row = 0; row < i; row++) {
      Vector realEigen = null;
      // the eigenvectors live as columns of V, in reverse order.  Weird but true.
      DoubleMatrix1D ejCol = eigenVects.viewColumn(i - row - 1);
      int size = Math.min(ejCol.size(), state.getBasisSize());
      for (int j = 0; j < size; j++) {
        double d = ejCol.get(j);
        Vector rowJ = state.getBasisVector(j);
        if(realEigen == null) {

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    } catch (IllegalArgumentException exc) {
      buf.append(unknown).append(exc.getMessage());
    }


    buf.append("\n\ninverse(A) = ");
    DoubleMatrix2D identity = org.apache.mahout.math.matrix.DoubleFactory2D.DENSE.identity(lu.rows());
    try {
      this.solve(identity);
      buf.append(String.valueOf(identity));
    } catch (IllegalArgumentException exc) {
      buf.append(unknown).append(exc.getMessage());

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   *
   * @return a new dice view.
   */
  @Override
  public DoubleMatrix2D viewDice() {
    DoubleMatrix2D view = new WrapperDoubleMatrix2D(this) {
      @Override
      public double getQuick(int row, int column) {
        return content.get(column, row);
      }

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   *                                   row+height>rows()</tt>
   */
  @Override
  public DoubleMatrix2D viewPart(final int row, final int column, int height, int width) {
    checkBox(row, column, height, width);
    DoubleMatrix2D view = new WrapperDoubleMatrix2D(this) {
      @Override
      public double getQuick(int i, int j) {
        return content.get(row + i, column + j);
      }

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    checkRowIndexes(rowIndexes);
    checkColumnIndexes(columnIndexes);
    final int[] rix = rowIndexes;
    final int[] cix = columnIndexes;


    DoubleMatrix2D view = new WrapperDoubleMatrix2D(this) {
      @Override
      public double getQuick(int i, int j) {
        return content.get(rix[i], cix[j]);
      }

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