Page 11-6
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). An example of the inverse of one of the matrices stored earlier is
presented next:
To verify the properties of the inverse matrix, we present the following
multiplications:
Characterizing a matrix (The matrix NORM menu)
The matrix NORM (NORMALIZE) menu is accessed through the keystroke
sequence „´ (system flag 117 set to CHOOSE boxes):
This menu contains the following functions:
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