Entry Catalog; Exact Math/Number Menu - Texas Instruments TITANIUM TI-89 User Manual

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
) ⇒ ⇒ ⇒ ⇒
integer
entry(
Returns a previous entry-line entry from the
Home screen history area.
, if included, specifies which entry
integer
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
exact()
MATH/Number menu
expression1
exact(
list1 tol
exact( [,
matrix1
exact( [,
Uses
Exact
Exact/Approx
possible, the rational-number equivalent of the
argument.
specifies the tolerance for the conversion; the
tol
default is 0 (zero).
816
expression
.
entry(1)
]) ⇒ ⇒ ⇒ ⇒
tol expression
[,
]) ⇒ ⇒ ⇒ ⇒
list
]) ⇒ ⇒ ⇒ ⇒
tol matrix
mode arithmetic regardless of the
mode setting to return, when
On the Home screen:
1+1/x ¸
1+1/entry(1) ¸
¸
¸
entry(4) ¸
exact(.25) ¸
exact(.333333) ¸
exact(.33333,.001)
exact(3.5x+y) ¸
exact({.2,.33,4.125}) ¸
Appendix A: Functions and Instructions
1
+ 1
x
1
2 ì
x+1
1
ø (2ø x+1) + 3/2
2
1
5 / 3 ì
3ø (3ø x+2)
1
+ 1
x
1/4
333333
1000000
1/3
7ø x
+ y
2
33
{1à5 33à8}
100