Kotlin – Matrix Subtraction

Kotlin – Matrix Subtraction

In Kotlin, matrix subtraction involves subtracting corresponding elements of two matrices to create a new matrix with the same dimensions.

Example

Let’s write with a simple example of subtracting two matrices element-wise.

Kotlin Program

fun main() {

    // Define the matrices
    val matrix1 = arrayOf(
        intArrayOf(1, 2, 3),
        intArrayOf(4, 5, 6)
    )
    val matrix2 = arrayOf(
        intArrayOf(1, 0, 1),
        intArrayOf(5, 1, 2)
    )

    // Perform matrix subtraction
    val resultMatrix = Array(matrix1.size) { i ->
        IntArray(matrix1[0].size) { j ->
            matrix1[i][j] - matrix2[i][j]
        }
    }

    // Print the result matrix
    for (row in resultMatrix) {
        for (element in row) {
            print("$element ")
        }
        println()
    }

}

Output

0 2 2 
-1 4 4

In the program,

  1. Define Matrices: Two matrices matrix1 and matrix2 are defined using nested arrays. These matrices are 2×3 matrices (2 rows and 3 columns).
  2. Perform Matrix Subtraction:
    • A new matrix resultMatrix is created using the Array constructor with the same dimensions as matrix1.
    • The elements of resultMatrix are calculated by subtracting the corresponding elements of matrix1 and matrix2.
  3. Print Result:
    • The result matrix is printed using nested loops. Each element of the result matrix is printed, and a newline is added after each row.

We have used nested for loop to iterate over the elements in all the rows of the two matrices.

References

Summary

Matrix subtraction in Kotlin is done by subtracting corresponding elements of two matrices to generate a new matrix with the same dimensions. It follows the basic mathematical principle of element-wise subtraction.