Texas Instruments TI-89 Manual Book page 485

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