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Appendix A: Functions and Instructions 835
limit() uses methods such as L’Hopital’s rule, so
there are unique limits that it cannot determine. I
f
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 ¸
"
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 ¸