Texas Instruments TITANIUM TI-89 - Manual (Page 816)

816 Appendix A: Functions and Instructions
EndLoop See Loop, page 840.
EndPrgm
See Prgm, page 855.
EndTBar See ToolBar, page 891.
EndTry See Try, page 891.
EndWhile
See While, page 894.
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) ¸ 2ì
1
x+1
¸
1
2 ш (2ш x+1) + 3/2
¸ 5/3м
1
3ш (3ш 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) ¸
7ø x
2
+ y
exact({.2,.33,4.125}) ¸
{1а5
33
100 33
а 8}