Examples of DenseObjectMatrix2D

cern.colt.matrix.impl.DenseObjectMatrix2D

Dense 2-d matrix holding Object elements. First see the package summary and javadoc tree view to get the broad picture.

Implementation:

Internally holds one single contigous one-dimensional array, addressed in row major. Note that this implementation is not synchronized.

Memory requirements:

memory [bytes] = 8*rows()*columns(). Thus, a 1000*1000 matrix uses 8 MB.

Time complexity:

O(1) (i.e. constant time) for the basic operations get, getQuick, set, setQuick and size,

Cells are internally addressed in row-major. Applications demanding utmost speed can exploit this fact. Setting/getting values in a loop row-by-row is quicker than column-by-column. Thus

 for (int row=0; row < rows; row++) { for (int column=0; column < columns; column++) { matrix.setQuick(row,column,someValue); } }

is quicker than

 for (int column=0; column < columns; column++) { for (int row=0; row < rows; row++) { matrix.setQuick(row,column,someValue); } }

@author wolfgang.hoschek@cern.ch @version 1.0, 09/24/99

 * @param values The values to be filled into the new matrix.
 * @throws IllegalArgumentException if <tt>for any 1 &lt;= row &lt; values.length: values[row].length != values[row-1].length</tt>.
 */
public ObjectMatrix2D make(Object[][] values) {
  if (this==sparse) return new SparseObjectMatrix2D(values);
  else return new DenseObjectMatrix2D(values);
}

/**
 * Constructs a matrix with the given shape, each cell initialized with zero.
 */
public ObjectMatrix2D make(int rows, int columns) {
  if (this==sparse) return new SparseObjectMatrix2D(rows,columns);
  else return new DenseObjectMatrix2D(rows,columns);
}

 * @param values The values to be filled into the new matrix.
 * @throws IllegalArgumentException if <tt>for any 1 &lt;= row &lt; values.length: values[row].length != values[row-1].length</tt>.
 */
public ObjectMatrix2D make(Object[][] values) {
  if (this==sparse) return new SparseObjectMatrix2D(values);
  else return new DenseObjectMatrix2D(values);
}

/**
 * Constructs a matrix with the given shape, each cell initialized with zero.
 */
public ObjectMatrix2D make(int rows, int columns) {
  if (this==sparse) return new SparseObjectMatrix2D(rows,columns);
  else return new DenseObjectMatrix2D(rows,columns);
}

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Examples of DenseObjectMatrix2D

Examples of cern.colt.matrix.impl.DenseObjectMatrix2D

Examples of cern.colt.matrix.impl.DenseObjectMatrix2D

Examples of cern.colt.matrix.impl.DenseObjectMatrix2D

Examples of cern.colt.matrix.impl.DenseObjectMatrix2D