Subtract Matrices

This algorithm finds difference between corresponding elements of two matrices.

• C#
• VB.Net
• C
• C++
• PHP

									public struct Matrix
{
	public int[,] _Matrix;
	public int Rows;
	public int Columns;

	public Matrix(int[,] matrix, int rows, int columns)
	{
		this._Matrix = matrix;
		this.Rows = rows;
		this.Columns = columns;
	}
}

public static Matrix SubtractMatrices(Matrix firstMatrix, Matrix secondMatrix)
{
	if (firstMatrix.Rows == secondMatrix.Rows && firstMatrix.Columns == secondMatrix.Columns)
	{
		int[,] sum = new int[firstMatrix.Rows, firstMatrix.Columns];

		for (int i = 0; i < firstMatrix.Rows; ++i)
		{
			for (int j = 0; j < firstMatrix.Columns; ++j)
			{
				sum[i, j] = firstMatrix._Matrix[i, j] - secondMatrix._Matrix[i, j];
			}
		}

		return new Matrix(sum, firstMatrix.Rows, firstMatrix.Columns);
	}

	return default(Matrix);
}
								

Example

									int[,] m1 = new int[2, 2];
m1[0, 0] = 8;
m1[0, 1] = 6;
m1[1, 0] = 7;
m1[1, 1] = 5;

int[,] m2 = new int[2, 2];
m2[0, 0] = 4;
m2[0, 1] = 3;
m2[1, 0] = 5;
m2[1, 1] = 2;

Matrix matrix1 = new Matrix(m1, 2, 2);
Matrix matrix2 = new Matrix(m2, 2, 2);
Matrix sumMatrix = SubtractMatrices(matrix1, matrix2);
								

Output

									[0, 0] = 4
[0, 1] = 3
[1, 0] = 2
[1, 1] = 3