Texas Instruments TI-89, TI-92

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 = ë1, 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 ë2.5 ¸

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 L

,L2

Done

owStat

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

NewP

,L2

Done

¥%