Texas Instruments PLUS TI-89 - Manual (Page 460)

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 ш (2ш x+1) + 3/2
¸ 5 / 3 м
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}) ¸
{ 1 а5
33
100
33 а8 }