HP 48gII Manuel d'utilisateur télécharger pdf (Page 123)

Page 9-6

The identity matrix

The identity matrix has the property that A⋅I = I⋅A = A. To verify this property

we present the following examples using the matrices stored earlier on. Use

function IDN (find it in the MTH/MATRIX/MAKE menu) to generate the

identity matrix as shown here:

The inverse matrix

The inverse of a square matrix A is the matrix A

-1

such that A⋅A

-1

= A

-1

⋅A = I,

where I is the identity matrix of the same dimensions as A. The inverse of a

matrix is obtained in the calculator by using the inverse function, INV (i.e., the

key). Examples of the inverse of some of the matrices stored earlier are

presented next:

To verify the properties of the inverse matrix, we present the following

multiplications:

1 2 ... 118 119 120 121 122 123 124 125 126 127 128 ... 174 175

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HP 48gII Manuel d'utilisateur Page 123