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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
¸