Method getColumn

JSAT/src/jsat/linear/Matrix.java:610–618

Creates a vector that has a copy of the values in column j of this matrix. Altering it will not effect the values in this matrix @param j the column to copy @return a clone of the column as a Vec

(int j)

     * @return a clone of the column as a {@link Vec}
     */
    public Vec getColumn(int j)
    {
        if(j < 0 || j >= cols())
            throw new ArithmeticException("Column was not a valid value " + j + " not in [0," + (cols()-1) + "]");
        DenseVector c = new DenseVector(rows());
        for(int i =0; i < rows(); i++)
            c.set(i, get(i, j));
        return c;
    }
    
    /**
     * Obtains a vector that is backed by <i>this</i>, at very little memory