Texas Instruments TI-86 - Using Math Operations with Matrices

244
Chapter 19: Applications
19APPS.DOC TI-86, Chap 19, US English Bob Fedorisko Revised: 02/13/01 2:41 PM Printed: 02/13/01 3:05 PM Page 244 of 1819APPS.DOC TI-86, Chap 19, US English Bob Fedorisko Revised: 02/13/01 2:41 PM Printed: 02/13/01 3:05 PM Page 244 of 18
Using Math Operations with Matrices

In the matrix editor, enter matrix
A
as shown.

On the home screen, select
rref
from the
MATRX OPS
menu.

To append a 3×3 identity matrix to matrix
A
, select
aug
from the
MATRX OPS
menu, enter
A
, select
ident
from the
MATRX OPS
menu, and then enter
3
. Execute the expression.

Enter
Ans
(to which the matrix from step 3 is stored). Define a
submatrix that contains the solution portion of the result. The
submatrix begins at element (1,4) and ends at element (3,6).

Select
4
Frac
from the
MATH MISC
menu and display the
fractional equivalent of the submatrix.

Check the result. Set the decimal mode to 11 (the last
1
) Select
round
from the
MATH NUM
menu for the product of the
fractional equivalent of the submatrix times
A
.
Displaying the result matrix
elements to 11 decimal
places illustrates accuracy.