Subtract Matrices

This algorithm finds difference between corresponding elements of two matrices.

• C#
• VB.Net
• C
• C++
• PHP

									/*****Please include following header files*****/
// stdlib.h
/***********************************************/

typedef struct {
	int** Matrix;
	int Rows;
	int Columns;
} Matrix;

int** CreateMatrix(int rowCount, int colCount) {
	int** matrix = (int**)malloc(sizeof(int*) * rowCount);

	for (int i = 0; i < rowCount; ++i) {
		matrix[i] = (int*)malloc(sizeof(int) * colCount);
	}

	return matrix;
}

Matrix SubtractMatrices(Matrix firstMatrix, Matrix secondMatrix) {
	if (firstMatrix.Rows == secondMatrix.Rows && firstMatrix.Columns == secondMatrix.Columns) {
		int** sum = CreateMatrix(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{ sum, firstMatrix.Rows, firstMatrix.Columns };
	}

	return{ NULL, 0, 0 };
}
								

Example

									int** m1 = CreateMatrix(2, 2);
m1[0][0] = 8;
m1[0][1] = 6;
m1[1][0] = 7;
m1[1][1] = 5;

int** m2 = CreateMatrix(2, 2);
m2[0][0] = 4;
m2[0][1] = 3;
m2[1][0] = 5;
m2[1][1] = 2;

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

Output

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