Texas Instruments TITANIUM TI-89 - Manual (Page 835)

Appendix A: Functions and Instructions 835
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 ¸
"
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 ¸