Method pascal

JSAT/src/jsat/linear/Matrix.java:1097–1108

Creates a new square matrix that is a pascal matrix. The pascal matrix of size n is n by n and symmetric. @param size the number of rows and columns for the matrix @return a pascal matrix of the desired size

(int size)

     * @return a pascal matrix of the desired size
     */
    public static Matrix pascal(int size)
    {
        if(size <= 0 )
            throw new ArithmeticException();
        DenseMatrix P = new DenseMatrix(size, size);
        RowColumnOps.fillRow(P, 0, 0, size, 1.0);
        RowColumnOps.fillCol(P, 0, 0, size, 1.0);
        for(int i = 1; i < size; i++)
            for(int j = 1; j < size; j++)
                P.set(i, j, P.get(i-1, j) + P.get(i, j-1));
        return P;
    }

    @Override
    abstract public Matrix clone();