Texas Instruments TI-89 User Manual - Page 843

MedMed MATH/Statistics/Regressions menu MedMed list1, list2[, [list3] [, list4, list5]] Calculates the median-median line and updates all the system statistics variables. All the lists must have equal dimensions except for list5. list1 represents xlist. list2 represents ylist. list3 represents frequency. list4 represents category codes. list5 represents category include list. Note: list1 through list4 must be a variable name or c1-c99 (columns in the last data variable shown in the Data/Matrix Editor). list5 does not have to be a variable name and cannot be c1- c99. In function graphing mode: {0,1,2,3,4,5,6}! L1 ¸ {0,2,3,4,3,4,6}! L2 ¸ MedMed L1,L2 ¸ ShowStat ¸ ¸ Regeq(x)! y1(x) ¸ NewPlot 1,1,L1,L2 ¸ ¥% {0 1 2 ...} {0 2 3 ...} Done Done Done mid( ) MATH/String menu mid(sourceString, start[, count]) ⇒ string Returns count characters from character string sourceString, beginning with character number start. If count is omitted or is greater than the dimension of sourceString, returns all characters from sourceString, beginning with character number start. count must be , 0. If count = 0, returns an empty string. mid(sourceList, start [, count]) ⇒ list Returns count elements from sourceList, beginning with element number start. If count is omitted or is greater than the dimension of sourceList, returns all elements from sourceList, beginning with element number start. count must be , 0. If count = 0, returns an empty list. mid(sourceStringList, start[, count]) ⇒ list Returns count strings from the list of strings sourceStringList, beginning with element number start. mid("Hello there",2) ¸ "ello there" mid("Hello there",7,3) ¸ "the" mid("Hello there",1,5) ¸ "Hello" mid("Hello there",1,0) ¸ "" mid({9,8,7,6},3) ¸ mid({9,8,7,6},2,2) ¸ mid({9,8,7,6},1,2) ¸ mid({9,8,7,6},1,0) ¸ {7 6} {8 7} {9 8} {} mid({"A","B","C","D"},2,2) ¸ {"B" "C"} Appendix A: Functions and Instructions 843