Texas Instruments PLUS TI-89 - Manual (Page 479)

462 Appendix A: Functions and Instructions
8992APPA.DOC TI-89 / TI-92 Plus: Appendix A (US English) Susan Gullord Revised: 02/23/01 1:48 PM Printed: 02/23/01 2:21 PM Page 462 of 132
LineTan CATALOG
LineTan expression1 , expression2
Displays the Graph screen and draws a line
tangent to
expression1 at the point specified.
expression1 is an expression or the name of a
function, where x is assumed to be the
independent variable, and expression2 is the x
value of the point that is tangent.
Note : In the example shown, expression1 is
graphed separately. LineTan does not graph
expression1.
In function graphing mode and a ZoomTrig
window:
Graph cos(x)
TI-89: "
TI-92 Plus: ¥ "
LineTan cos(x), p/4 ¸
LineVert CATALOG
LineVert x [, drawMode ]
Displays the Graph screen and draws, erases,
or inverts a vertical line at window position
x .
If drawMode = 1, draws the line (default).
If drawMode = 0, turns off the line.
If drawMode = ë 1, turns a line that is on to off
or off to on (inverts pixels along the line).
Note : Regraphing erases all drawn items. See
also PxlVert .
In a ZoomStd window:
LineVert ë 2.5 ¸
LinReg MATH/Statistics/Regressions menu
LinReg list1 , list2 [ , [ list3 ] [, list4 , list5 ] ]
Calculates the linear regression 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.
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 ...}
LinReg L1,L2 ¸ Done
ShowStat ¸
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.
¸
Regeq(x) "y1(x) ¸ Done
NewPlot 1,1,L1,L2 ¸ Done
¥ %