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).
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