Texas Instruments PLUS TI-89 - Manual (Page 478)

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 = 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 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 = 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 PxlHorz .
In a ZoomStd window:
LineHorz 2.5 ¸