/** Gets the average degree of this matrix. */
public double getAvgDegree() {
double rowSums = 0;
for (int i = 0; i < matrix.rows(); i++) {
for (int j = 0; j < matrix.columns(); j++) {
rowSums += matrix.get(i, j);
}
}
return rowSums / matrix.rows();
}
/**
* Copies the matrix elements from the specified DenseDoubleMatrix2D. The matrix element at ij is
* set to 0 if the element at DoubleMatrix[i][j] = 0, otherwise the matrix element at ij is set to
* 1.
*
* @param m the actual matrix data for this AdjacencyMatrix
*/
public void setMatrix(DenseDoubleMatrix2D m) {
int rows = m.rows();
int cols = m.columns();
matrix = new BitMatrix2D(rows, cols);
for (int i = 0; i < rows; i++) {
for (int j = 0; j < cols; j++) {
matrix.set(i, j, (byte) m.getQuick(i, j));
}
}
}
/**
* Returns a String representation of this AdjacencyMatrix (comment etc.) together with the actual
* data matrix.
*/
public String toString() {
String s = "Matrix Name: " + this.matrixLabel + "\n";
s += "Matrix Labels: ";
for (int i = 0; i < labels.size(); i++) {
if (i == 0) {
s += (String) labels.get(i);
} else {
s += ", " + (String) labels.get(i);
}
}
s += "\nComment: " + comment;
return s + "\nAvg Degree: " + getAvgDegree() + "\n" + matrix.toString();
}
/** Returns a String representation of only the actual data matrix. */
public String matrixToString() {
String m = matrix.toString();
int index = m.indexOf("\n");
return m.substring(index + 1, m.length());
}
/** Returns the number of columns in the matrix. */
public int columns() {
return matrix.columns();
}
/** Returns the number of rows int matrix. */
public int rows() {
return matrix.rows();
}
/**
* Gets the value at row, col. This returns a double rather than a byte for implementation
* reasons.
*
* @param row the row index (i)
* @param col the col index (j)
* @return the byte value at row, col (ij) as a double.
*/
public double get(int row, int col) {
return matrix.get(row, col);
}
/**
* Sets a data value in this matrix. If val equals the matrix element at row, col will be set to
* 0, otherwise it is set to 1.
*
* @param row the row index (i)
* @param col the col index (j)
* @para val the value to set ij to.
*/
public void set(int row, int col, double val) {
matrix.set(row, col, (byte) val);
}
/**
* Sets a data value in this matrix. If val equals the matrix element at row, col will be set to
* 0, otherwise it is set to 1.
*
* @param row the row index (i)
* @param col the col index (j)
* @para val the value to set ij to.
*/
public void set(int row, int col, byte val) {
matrix.set(row, col, val);
}
/** Gets (computes) the density of this matrix. */
public double getDensity() {
double sum = matrix.zSum();
return sum / matrix.rows() * (matrix.rows() - 1);
}
/**
* Gets the specified row of data for this matrix.
*
* @param row the index of the row to get
*/
public DenseDoubleMatrix1D getRow(int row) {
return matrix.getRow(row);
}