Texas Instruments TI-89 User Manual - Page 816
EndLoop, EndPrgm, EndTBar, EndTry, EndWhile, exact, On the Home screen
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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+1/entry(1) ¸ ¸ ¸ entry(4) ¸ 1 x + 1 2 ì 1 x+1 2ø 1 (2ø x+1) + 3/2 5 / 3 ì 3ø 1 (3ø x+2) 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) ¸ exact(.333333) ¸ exact(.33333,.001) exact(3.5x+y) ¸ 1/4 333333 1000000 1/3 7ø x 2 + y exact({.2,.33,4.125}) ¸ {1à5 33 100 33à8} 816 Appendix A: Functions and Instructions