Method getColumnView

JSAT/src/jsat/linear/Matrix.java:628–671

Obtains a vector that is backed by this , at very little memory cost. Mutations to this vector will alter the values stored in the matrix, and vice versa. @param j the column to obtain a view of @return a vector backed by the specified row of the matrix

(final int j)

     * @return a vector backed by the specified row of the matrix
     */
    public Vec getColumnView(final int j)
    {
        final Matrix M = this;
        return new Vec() 
        {
            /**
			 * 
			 */
			private static final long serialVersionUID = 7107290189250645384L;

			@Override
            public int length()
            {
                return rows();
            }

            @Override
            public double get(int index)
            {
                return M.get(index, j);
            }

            @Override
            public void set(int index, double val)
            {
                M.set(index, j, val);
            }

            @Override
            public boolean isSparse()
            {
                return M.isSparce();
            }

            @Override
            public Vec clone()
            {
                if(M.isSparce())
                    return new SparseVector(this);
                else
                    return new DenseVector(this);
            }
        };
    }
    
    /**
     * Creates a vector that has a copy of the values in row <i>i</i> of this