/**
* Returns {@code true} if the two vectors are equal to one another. Two {@code Vector} insances
* are considered equal if they contain the same number of elements and all corresponding pairs of
* {@code Number} values are equal. Two values {@code n1} and {@code n2} are considered equal if
* {@code n1.equals(n2)}.
*/
public static boolean equals(Vector v1, Vector v2) {
if (v1.length() == v2.length()) {
int length = v1.length();
for (int i = 0; i < length; ++i) {
Number n1 = v1.getValue(i);
Number n2 = v2.getValue(i);
if (!n1.equals(n2)) return false;
}
return true;
}
return false;
}
/**
* Creates a copy of a given {@code Vector}.
*
* @param source The {@code Vector} to copy.
* @return A copy of {@code source} with the same type.
*/
public static Vector copyOf(Vector source) {
if (source instanceof DoubleVector) return copyOf((DoubleVector) source);
if (source instanceof IntegerVector) return copyOf((IntegerVector) source);
Vector result = new DenseVector(source.length());
for (int i = 0; i < source.length(); ++i) result.set(i, source.getValue(i));
return result;
}
/**
* Copies all of the values from one {@code Vector} into another. After the operation, all of the
* values in {@code dest} will be the same as that of {@code source}. The legnth of {@code dest}
* must be as long as the length of {@code source}. Once completed {@code dest} is returned.
*
* @param dest The {@code Vector} to copy values into.
* @param source The {@code Vector} to copy values from.
* @return {@code dest} after being copied from {@code source}.
* @throws IllegalArgumentException if the length of {@code dest} is less than that of {@code
* source}.
*/
public static Vector copy(Vector dest, Vector source) {
for (int i = 0; i < source.length(); ++i) dest.set(i, source.getValue(i).doubleValue());
return dest;
}
