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Solution Review: Multiply the Matrices

Solution Review: Multiply the Matrices

Have a look at the solution to the 'Multiply the Matrices' challenges.

Rubric criteria

Solution

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class Multiply
{
public static void main(String args[])
{
// Creating matrices
int[][] matrix1 = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
int[][] matrix2 = {{1, 2}, {4, 2}, {7, 2}};
int[][] product = new int[matrix1.length][matrix2[0].length];
if (multiply(matrix1, matrix2, product)) // If multiplication possible // Calling the method
{
// Printing the product array
for(int i = 0; i < product.length; i++)
{
for(int j = 0; j < product[i].length; j++)
{
System.out.print(product[i][j]);
System.out.print(" ");
}
System.out.print("\n");
}
}
else
{
System.out.println("Multiplication order not satisfied.");
}
}
// Method to multiply matrices
public static boolean multiply(int[][] matrix1, int[][] matrix2, int[][]product)
{
if (matrix1[0].length == matrix2.length)
{
for(int i = 0; i < matrix1.length; i++)
{
for(int j = 0; j < matrix2[i].length; j++)
{
for(int k = 0; k < matrix1[i].length; k++)
{
product[i][j] += matrix1[i][k] * matrix2[k][j];
}
}
}
return true;
}
else
{
return false;
}
}
}

Rubric-wise explanation

Initially, we create two 2D arrays: matrix1 and matrix2. Then, we create a 2D array, product, to store the ...