commons-math-legacy/src/main/java/org/apache/commons/math4/legacy/linear/ArrayFieldVector.java [886:1043]:
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    public T walkInDefaultOrder(final FieldVectorPreservingVisitor<T> visitor) {
        final int dim = getDimension();
        visitor.start(dim, 0, dim - 1);
        for (int i = 0; i < dim; i++) {
            visitor.visit(i, getEntry(i));
        }
        return visitor.end();
    }

    /**
     * Visits (but does not alter) some entries of this vector in default order
     * (increasing index).
     *
     * @param visitor visitor to be used to process the entries of this vector
     * @param start the index of the first entry to be visited
     * @param end the index of the last entry to be visited (inclusive)
     * @return the value returned by {@link FieldVectorPreservingVisitor#end()}
     * at the end of the walk
     * @throws NumberIsTooSmallException if {@code end < start}.
     * @throws OutOfRangeException if the indices are not valid.
     * @since 3.3
     */
    public T walkInDefaultOrder(final FieldVectorPreservingVisitor<T> visitor,
                                final int start, final int end)
        throws NumberIsTooSmallException, OutOfRangeException {
        checkIndices(start, end);
        visitor.start(getDimension(), start, end);
        for (int i = start; i <= end; i++) {
            visitor.visit(i, getEntry(i));
        }
        return visitor.end();
    }

    /**
     * Visits (but does not alter) all entries of this vector in optimized
     * order. The order in which the entries are visited is selected so as to
     * lead to the most efficient implementation; it might depend on the
     * concrete implementation of this abstract class.
     *
     * @param visitor the visitor to be used to process the entries of this
     * vector
     * @return the value returned by {@link FieldVectorPreservingVisitor#end()}
     * at the end of the walk
     * @since 3.3
     */
    public T walkInOptimizedOrder(final FieldVectorPreservingVisitor<T> visitor) {
        return walkInDefaultOrder(visitor);
    }

    /**
     * Visits (but does not alter) some entries of this vector in optimized
     * order. The order in which the entries are visited is selected so as to
     * lead to the most efficient implementation; it might depend on the
     * concrete implementation of this abstract class.
     *
     * @param visitor visitor to be used to process the entries of this vector
     * @param start the index of the first entry to be visited
     * @param end the index of the last entry to be visited (inclusive)
     * @return the value returned by {@link FieldVectorPreservingVisitor#end()}
     * at the end of the walk
     * @throws NumberIsTooSmallException if {@code end < start}.
     * @throws OutOfRangeException if the indices are not valid.
     * @since 3.3
     */
    public T walkInOptimizedOrder(final FieldVectorPreservingVisitor<T> visitor,
                                  final int start, final int end)
        throws NumberIsTooSmallException, OutOfRangeException {
        return walkInDefaultOrder(visitor, start, end);
    }

    /**
     * Visits (and possibly alters) all entries of this vector in default order
     * (increasing index).
     *
     * @param visitor the visitor to be used to process and modify the entries
     * of this vector
     * @return the value returned by {@link FieldVectorChangingVisitor#end()}
     * at the end of the walk
     * @since 3.3
     */
    public T walkInDefaultOrder(final FieldVectorChangingVisitor<T> visitor) {
        final int dim = getDimension();
        visitor.start(dim, 0, dim - 1);
        for (int i = 0; i < dim; i++) {
            setEntry(i, visitor.visit(i, getEntry(i)));
        }
        return visitor.end();
    }

    /**
     * Visits (and possibly alters) some entries of this vector in default order
     * (increasing index).
     *
     * @param visitor visitor to be used to process the entries of this vector
     * @param start the index of the first entry to be visited
     * @param end the index of the last entry to be visited (inclusive)
     * @return the value returned by {@link FieldVectorChangingVisitor#end()}
     * at the end of the walk
     * @throws NumberIsTooSmallException if {@code end < start}.
     * @throws OutOfRangeException if the indices are not valid.
     * @since 3.3
     */
    public T walkInDefaultOrder(final FieldVectorChangingVisitor<T> visitor,
                                final int start, final int end)
        throws NumberIsTooSmallException, OutOfRangeException {
        checkIndices(start, end);
        visitor.start(getDimension(), start, end);
        for (int i = start; i <= end; i++) {
            setEntry(i, visitor.visit(i, getEntry(i)));
        }
        return visitor.end();
    }

    /**
     * Visits (and possibly alters) all entries of this vector in optimized
     * order. The order in which the entries are visited is selected so as to
     * lead to the most efficient implementation; it might depend on the
     * concrete implementation of this abstract class.
     *
     * @param visitor the visitor to be used to process the entries of this
     * vector
     * @return the value returned by {@link FieldVectorChangingVisitor#end()}
     * at the end of the walk
     * @since 3.3
     */
    public T walkInOptimizedOrder(final FieldVectorChangingVisitor<T> visitor) {
        return walkInDefaultOrder(visitor);
    }

    /**
     * Visits (and possibly change) some entries of this vector in optimized
     * order. The order in which the entries are visited is selected so as to
     * lead to the most efficient implementation; it might depend on the
     * concrete implementation of this abstract class.
     *
     * @param visitor visitor to be used to process the entries of this vector
     * @param start the index of the first entry to be visited
     * @param end the index of the last entry to be visited (inclusive)
     * @return the value returned by {@link FieldVectorChangingVisitor#end()}
     * at the end of the walk
     * @throws NumberIsTooSmallException if {@code end < start}.
     * @throws OutOfRangeException if the indices are not valid.
     * @since 3.3
     */
    public T walkInOptimizedOrder(final FieldVectorChangingVisitor<T> visitor,
                                  final int start, final int end)
        throws NumberIsTooSmallException, OutOfRangeException {
        return walkInDefaultOrder(visitor, start, end);
    }

    /**
     * Test for the equality of two vectors.
     *
     * @param other Object to test for equality.
     * @return {@code true} if two vector objects are equal, {@code false}
     * otherwise.
     */
    @Override
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commons-math-legacy/src/main/java/org/apache/commons/math4/legacy/linear/SparseFieldVector.java [597:748]:
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    public T walkInDefaultOrder(final FieldVectorPreservingVisitor<T> visitor) {
        final int dim = getDimension();
        visitor.start(dim, 0, dim - 1);
        for (int i = 0; i < dim; i++) {
            visitor.visit(i, getEntry(i));
        }
        return visitor.end();
    }

    /**
     * Visits (but does not alter) some entries of this vector in default order
     * (increasing index).
     *
     * @param visitor visitor to be used to process the entries of this vector
     * @param start the index of the first entry to be visited
     * @param end the index of the last entry to be visited (inclusive)
     * @return the value returned by {@link FieldVectorPreservingVisitor#end()}
     * at the end of the walk
     * @throws NumberIsTooSmallException if {@code end < start}.
     * @throws OutOfRangeException if the indices are not valid.
     * @since 3.3
     */
    public T walkInDefaultOrder(final FieldVectorPreservingVisitor<T> visitor,
                                final int start, final int end)
        throws NumberIsTooSmallException, OutOfRangeException {
        checkIndices(start, end);
        visitor.start(getDimension(), start, end);
        for (int i = start; i <= end; i++) {
            visitor.visit(i, getEntry(i));
        }
        return visitor.end();
    }

    /**
     * Visits (but does not alter) all entries of this vector in optimized
     * order. The order in which the entries are visited is selected so as to
     * lead to the most efficient implementation; it might depend on the
     * concrete implementation of this abstract class.
     *
     * @param visitor the visitor to be used to process the entries of this
     * vector
     * @return the value returned by {@link FieldVectorPreservingVisitor#end()}
     * at the end of the walk
     * @since 3.3
     */
    public T walkInOptimizedOrder(final FieldVectorPreservingVisitor<T> visitor) {
        return walkInDefaultOrder(visitor);
    }

    /**
     * Visits (but does not alter) some entries of this vector in optimized
     * order. The order in which the entries are visited is selected so as to
     * lead to the most efficient implementation; it might depend on the
     * concrete implementation of this abstract class.
     *
     * @param visitor visitor to be used to process the entries of this vector
     * @param start the index of the first entry to be visited
     * @param end the index of the last entry to be visited (inclusive)
     * @return the value returned by {@link FieldVectorPreservingVisitor#end()}
     * at the end of the walk
     * @throws NumberIsTooSmallException if {@code end < start}.
     * @throws OutOfRangeException if the indices are not valid.
     * @since 3.3
     */
    public T walkInOptimizedOrder(final FieldVectorPreservingVisitor<T> visitor,
                                  final int start, final int end)
        throws NumberIsTooSmallException, OutOfRangeException {
        return walkInDefaultOrder(visitor, start, end);
    }

    /**
     * Visits (and possibly alters) all entries of this vector in default order
     * (increasing index).
     *
     * @param visitor the visitor to be used to process and modify the entries
     * of this vector
     * @return the value returned by {@link FieldVectorChangingVisitor#end()}
     * at the end of the walk
     * @since 3.3
     */
    public T walkInDefaultOrder(final FieldVectorChangingVisitor<T> visitor) {
        final int dim = getDimension();
        visitor.start(dim, 0, dim - 1);
        for (int i = 0; i < dim; i++) {
            setEntry(i, visitor.visit(i, getEntry(i)));
        }
        return visitor.end();
    }

    /**
     * Visits (and possibly alters) some entries of this vector in default order
     * (increasing index).
     *
     * @param visitor visitor to be used to process the entries of this vector
     * @param start the index of the first entry to be visited
     * @param end the index of the last entry to be visited (inclusive)
     * @return the value returned by {@link FieldVectorChangingVisitor#end()}
     * at the end of the walk
     * @throws NumberIsTooSmallException if {@code end < start}.
     * @throws OutOfRangeException if the indices are not valid.
     * @since 3.3
     */
    public T walkInDefaultOrder(final FieldVectorChangingVisitor<T> visitor,
                                final int start, final int end)
        throws NumberIsTooSmallException, OutOfRangeException {
        checkIndices(start, end);
        visitor.start(getDimension(), start, end);
        for (int i = start; i <= end; i++) {
            setEntry(i, visitor.visit(i, getEntry(i)));
        }
        return visitor.end();
    }

    /**
     * Visits (and possibly alters) all entries of this vector in optimized
     * order. The order in which the entries are visited is selected so as to
     * lead to the most efficient implementation; it might depend on the
     * concrete implementation of this abstract class.
     *
     * @param visitor the visitor to be used to process the entries of this
     * vector
     * @return the value returned by {@link FieldVectorChangingVisitor#end()}
     * at the end of the walk
     * @since 3.3
     */
    public T walkInOptimizedOrder(final FieldVectorChangingVisitor<T> visitor) {
        return walkInDefaultOrder(visitor);
    }

    /**
     * Visits (and possibly change) some entries of this vector in optimized
     * order. The order in which the entries are visited is selected so as to
     * lead to the most efficient implementation; it might depend on the
     * concrete implementation of this abstract class.
     *
     * @param visitor visitor to be used to process the entries of this vector
     * @param start the index of the first entry to be visited
     * @param end the index of the last entry to be visited (inclusive)
     * @return the value returned by {@link FieldVectorChangingVisitor#end()}
     * at the end of the walk
     * @throws NumberIsTooSmallException if {@code end < start}.
     * @throws OutOfRangeException if the indices are not valid.
     * @since 3.3
     */
    public T walkInOptimizedOrder(final FieldVectorChangingVisitor<T> visitor,
                                  final int start, final int end)
        throws NumberIsTooSmallException, OutOfRangeException {
        return walkInDefaultOrder(visitor, start, end);
    }

    /** {@inheritDoc} */
    @Override
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