/**
* Compute the dot product.
*
* @param v vector with which dot product should be computed
* @return the scalar dot product between instance and v
* @exception IllegalArgumentException if v is not the same size as this
*/
public T dotProduct(ArrayFieldVector<T> v) {
checkVectorDimensions(v.data.length);
T dot = field.getZero();
for (int i = 0; i < data.length; i++) {
dot = dot.add(data[i].multiply(v.data[i]));
}
return dot;
}
/**
* Element-by-element division.
*
* @param v vector by which instance elements must be divided
* @return a vector containing this[i] / v[i] for all i
* @throws IllegalArgumentException if v is not the same size as this
*/
public ArrayFieldVector<T> ebeDivide(ArrayFieldVector<T> v) {
checkVectorDimensions(v.data.length);
T[] out = buildArray(data.length);
for (int i = 0; i < data.length; i++) {
out[i] = data[i].divide(v.data[i]);
}
return new ArrayFieldVector<T>(field, out, false);
}
/** {@inheritDoc} */
public T dotProduct(FieldVector<T> v) {
try {
return dotProduct((ArrayFieldVector<T>) v);
} catch (ClassCastException cce) {
checkVectorDimensions(v);
T dot = field.getZero();
for (int i = 0; i < data.length; i++) {
dot = dot.add(data[i].multiply(v.getEntry(i)));
}
return dot;
}
}
/** {@inheritDoc} */
public FieldVector<T> ebeDivide(FieldVector<T> v) {
try {
return ebeDivide((ArrayFieldVector<T>) v);
} catch (ClassCastException cce) {
checkVectorDimensions(v);
T[] out = buildArray(data.length);
for (int i = 0; i < data.length; i++) {
out[i] = data[i].divide(v.getEntry(i));
}
return new ArrayFieldVector<T>(field, out, false);
}
}
/**
* Check if instance and specified vectors have the same dimension.
*
* @param v vector to compare instance with
* @exception IllegalArgumentException if the vectors do not have the same dimension
*/
protected void checkVectorDimensions(FieldVector<T> v) {
checkVectorDimensions(v.getDimension());
}
