Question

How to calculate the determinant of a 2X2 matrix in Swift

Answer 1

// determinant is a scalar-valued of the entries of a square matrix

let SIZE = 2

let arr: [[Float]] = [
    [3, 8],
    [4, 6]
]

/*
 *       a b
 * arr = c d
 *
 * determinant = a*d - b*c
 */

let determinant = (arr[0][0] * arr[1][1]) - (arr[0][1] * arr[1][0])

print(determinant)

 
 
/*
run:
 
-14.0
 
*/

 

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