/**

* multiply a scalar value (constant) into a matrix.

* IMPORTANT: the matrix passed should NOT be modified.

* @param m: matrix from which scalar is to be subtracted

* @param b: scalar to be subtracted

* @return resulting Matrix

*/

public static Matrix multiply(Matrix m, double b)

{

Matrix result = new Matrix();

return result; //to be completed

}

/**

* add to matrices.

* IMPORTANT: neither of the passed matrices should be modified

* @param m: matrix 1

* @param n: matrix 2

* @return if m and n have the same dimensions, return

* result of adding the two matrices, otherwise return null

*/

public static Matrix add(Matrix m, Matrix n)

{

Matrix result = new Matrix();

return result; //to be completed

}