HP 49g+ - Manual (Page 120)

Page 9-3
Operations with matrices
Matrices, like other mathematical objects, can be added and subtracted.
They can be multiplied by a scalar, or among themselves. An important
operation for linear algebra applications is the inverse of a matrix. Details of
these operations are presented next.
To illustrate the operations we will create a number of matrices that we will
store in the following variables. Here are the matrices A22, B22, A23, B23,
A33 and B33:
In RPN mode, the steps to follow are:
{2,2}` RANM 'A22'`K {2,2}` RANM 'B22'`K
{2,3}` RANM 'A23'`K {2,3}` RANM 'B23'`K
{3,2}` RANM 'A32'`K {3,2}` RANM 'B32'`K
{3,3}` RANM 'A33'`K {3,3}` RANM 'B33'`K
Addition and subtraction
Four examples are shown below using the matrices stored above (ALG mode).