Casio FX-9860G (A), (A), −1 −2, Example, Example, Matrix A, uDeterminant, Matrix A = 3, [OPTN]-[MAT]-[Det], [OPTN]-[MAT]-[Trn], K2(MAT)3(Det)1(Mat), K2(MAT)4(Trn)1(Mat)

2-8-18

Matrix Calculations

uDeterminant						[OPTN]-[MAT]-[Det]
Example	Obtain the determinant for the following matrix :
			1	2	3
	Matrix A =	4		5	6
			−1 −2		0
	K2(MAT)3(Det)1(Mat)
	av(A)w
uMatrix Transposition						[OPTN]-[MAT]-[Trn]
A matrix is transposed when its rows become columns and its columns become rows.
Example	To transpose the following matrix :

12

Matrix A = 3 4

56

K2(MAT)4(Trn)1(Mat)

av(A)w

#Determinants can be obtained only for square matrices (same number of rows and columns). Trying to obtain a determinant for a matrix that is not square produces an error.

#The determinant of a 2 ⋅ 2 matrix is calculated as shown below.

A =	a11	a12	= a11a22 – a12a21
		a22
	a21

#The determinant of a 3 ⋅ 3 matrix is calculated as shown below.

a11 a12 a13

A = a21 a22 a23

a31 a32 a33

=a11a22a33 + a12a23a31 + a13a21a32

–a11a23a32 – a12a21a33 – a13a22a31

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