Texas Instruments TI89TITANIUM User Manual - Page 788
approx, Archive, arcLen, list1, start
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ans( ) 2 ± key ans() ⇒ value ans(integer) ⇒ value To use ans() to generate the Fibonacci sequence on the Home screen, press: Returns a previous answer from the Home screen 1 ¸ 1 history area. 1 ¸ 1 integer, if included, specifies which previous answer to recall. Valid range for integer is from 1 to 99 and cannot be an expression. Default is 1, 2 ± « 2 ± A 0 2 ¸ ¸ ¸ 2 3 5 the most recent answer. approx() MATH/Algebra menu approx(expression) ⇒ value Returns the evaluation of expression as a decimal value, when possible, regardless of the current Exact/Approx mode. This is equivalent to entering expression and pressing ¥ ¸ on the Home screen. approx(list1) ⇒ list approx(matrix1) ⇒ matrix Returns a list or matrix where each element has been evaluated to a decimal value, when possible. approx(p) ¸ 3.141... approx({sin(p),cos(p)}) ¸ {0. ë1.} approx([‡(2),‡(3)]) ¸ [1.414... 1.732...] Archive CATALOG Archive var1 [, var2] [, var3] ... 10!arctest ¸ 10 Moves the specified variables from RAM to the user data archive memory. Archive arctest ¸ 5ùarctest ¸ 15!arctest ¸ Done 50 You can access an archived variable the same as you would a variable in RAM. However, you cannot delete, rename, or store to an archived variable because it is locked automatically. To unarchive variables, use Unarchiv. N Unarchiv arctest ¸ Done 15!arctest ¸ 15 arcLen( ) MATH/Calculus menu arcLen(expression1,var,start,end) ⇒ expression Returns the arc length of expression1 from start to end with respect to variable var. Regardless of the graphing mode, arc length is calculated as an integral assuming a function mode definition. arcLen(list1,var,start,end) ⇒ list Returns a list of the arc lengths of each element of list1 from start to end with respect to var. arcLen(cos(x),x,0,p) ¸ 3.820... arcLen(f(x),x,a,b) ¸ b ⌠ ⌡ (ddx(f(x)))ñ+1 dx a arcLen({sin(x),cos(x)},x,0,p) {3.820... 3.820...} 788 Appendix A: Functions and Instructions