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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

Y 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:

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HP 50g User Manual Page 120