package mikera.matrixx.impl;
import mikera.matrixx.AMatrix;
import mikera.vectorz.AVector;
import mikera.vectorz.impl.AMatrixViewVector;
/**
* A class representing a view of a matrix row as a vector
* @author Mike
*/
@SuppressWarnings("serial")
public final class MatrixRowView extends AMatrixViewVector {
private final int row;
public MatrixRowView(AMatrix aMatrix, int row) {
super(aMatrix,aMatrix.columnCount());
this.row = row;
}
@Override
public double get(int i) {
return source.get(row, i);
}
@Override
public double unsafeGet(int i) {
return source.unsafeGet(row, i);
}
@Override
public void set(int i, double value) {
source.set(row, i, value);
}
@Override
public void unsafeSet(int i, double value) {
source.unsafeSet(row, i, value);
}
@Override
public boolean isFullyMutable() {
return source.isFullyMutable();
}
@Override
public MatrixRowView exactClone() {
return new MatrixRowView(source.exactClone(), row);
}
@Override public void getElements(double[] data, int offset) {
source.copyRowTo(row,data,offset);
}
@Override
protected int calcRow(int i) {
return row;
}
@Override
protected int calcCol(int i) {
return i;
}
@Override
public AVector clone() {
return source.getRowClone(row);
}
@Override
public boolean equals(AVector v) {
if (v==this) return true;
if (v.length()!=length) return false;
for (int i=0; i<length; i++) {
if (v.unsafeGet(i)!=source.unsafeGet(row,i)) return false;
}
return true;
}
@Override
public double dotProduct(double[] data, int offset) {
AVector r=source.getRow(row);
double result=0.0;
for (int i=0; i<length; i++) {
result+=data[offset+i]*r.unsafeGet(i);
}
return result;
}
}