Texas Instruments PLUS TI-89 - Manual (Page 353)

336 Chapter 19: Numeric Solver
19SOLVER.DOC TI-89/TI-92 Plus: Numeric Solver (English) Susan Gullord Revised: 02/23/01 1:16 PM Printed: 02/23/01 2:19 PM Page 336 of 10
Your most recently entered equations (up to 11 with the default
setting) are retained in memory. To recall one of these equations:
1. From the Numeric Solver
screen, press ‡.
A dialog box displays the most
recently entered equation.
2. Select an equation.
¦ To select the displayed
equation, press ¸.
¦ To select a different
equation, press B to display
a list. Then select the one
you want.
3. Press ¸.
Because the number of equations that you can recall with ‡ Eqns is
limited, a particular equation may not be retained indefinitely.
To store the current equation for future
use, save it to a variable.
1. From the Numeric Solver screen,
press ƒ and select 2:Save Copy As.
2. Specify a folder and a variable
name for the equation.
3. Press ¸ twice.
To open a previously saved equation
variable:
1. From the Numeric Solver screen,
press ƒ and select 1:Open .
2. Select the applicable folder and
equation variable.
3. Press ¸.
Recalling Previously
Entered Equations
Tip: You can specify how
many equations are retained.
From the Numeric Solver,
press
ƒ and select 9:Format
( or use TI - 89: ¥ Í
TI - 92 Plus: ¥ F). Then select
a number from 1 through 11.
Saving Equations
for Future Use
Note: An equation variable
has an EXPR data type, as
shown on the MEMORY and
VAR-LINK
screens.
Opening a Saved
Equation
Only unique equations are
listed. If you re-enter the
same equation 5 times, it
appears only once.
Variable eqn contains the current
equation; it always appears
alphabetically in the list.