Calculator User Manual

Appendix A: Functions and Instructions 443
8992APPA.DOC TI-89 / TI-92 Plus: Appendix A (US English) Susan Gullord Revised: 02/23/01 1:48 PM Printed: 02/23/01 2:21 PM Page 443 of 132
EndCustm
See
Custom
, page 429.
EndDlog
See
Dialog
, page 437.
EndFor
See
For
, page 450.
EndFunc
See
Func
, page 451.
EndIf
See
If
, page 456.
EndLoop
See
Loop
, page 466.
EndPrgm
See
Prgm
, page 481.
EndTBar
See
ToolBar
, page 515.
EndTry
See
Try
, page 515.
EndWhile
See
While
, page 518.
entry()
CATALOG
entry()
⇒
expression
entry(
integer
)
⇒
expression
Returns a previous entry-line entry from the
Home screen history area.
integer
, if included, specifies which entry
expression in the history area. The default is
1, the most recently evaluated entry. Valid
range is from 1 to 99 and cannot be an
expression.
Note: If the last entry is still highlighted on
the Home screen, pressing
¸
is
equivalent to executing
entry(1)
.
On the Home screen:
1+1/x
¸
1
x
+ 1
1+1/entry(1)
¸
2
ì
1
x+1
¸
1
2
ø
(2
ø
x+1)
+ 3/2
¸
5/3
ì
1
3
ø
(3
ø
x+2)
entry(4)
¸
1
x
+ 1
exact()
MATH/Number menu
exact(
expression1
[
,
tol
]
)
⇒
expression
exact(
list1
[
,
tol
]
)
⇒
list
exact(
matrix1
[
,
tol
]
)
⇒
matrix
Uses
Exact
mode arithmetic regardless of the
Exact/Approx
mode setting to return, when
possible, the rational-number equivalent of
the argument.
tol
specifies the tolerance for the conversion;
the default is 0 (zero).
exact(.25)
¸
1/4
exact(.333333)
¸
333333
1000000
exact(.33333,.001) 1/3
exact(3.5x+y)
¸
7
ø
x
2
+ y
exact({.2,.33,4.125})
¸
{
1à5
33
100
33à8
}