Appendix A: Functions and Instructions 461
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 461 of 132
limit() uses methods such as L’Hopital’s rule,
so there are unique limits that it cannot
determine. If expression1 contains undefined
variables other than var, you might have to
constrain them to obtain a more concise
result.
Limits can be very sensitive to rounding
error. When possible, avoid the APPROX
setting of the Exact/Approx mode and
approximate numbers when computing
limits. Otherwise, limits that should be zero
or have infinite magnitude probably will not,
and limits that should have finite non-zero
magnitude might not.
limit(a^x,x,ˆ) ¸undef
limit(a^x,x,ˆ)|a>1 ¸ˆ
limit(a^x,x,ˆ)
|
a>0 and a<1
¸0
Line CATALOG
Line xStart, yStart, xEnd, yEnd[, drawMode]
Displays the Graph screen and draws, erases,
or inverts a line segment between the
window coordinates (xStart, yStart) and
(xEnd, yEnd), including both endpoints.
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 PxlLine.
In the ZoomStd window, draw a line and
then erase it.
Line 0,0,6,9 ¸
TI-89: "
TI-92 Plus: ¥"
Line 0,0,6,9,0 ¸
LineHorz CATALOG
LineHorz y [, drawMode]
Displays the Graph screen and draws, erases,
or inverts a horizontal line at window
position y.
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 PxlHorz.
In a ZoomStd window:
LineHorz 2.5 ¸