Texas Instruments TI-89 Titanium Short User Manual page 186

DrawSlp
CATALOG
x1
DrawSlp ,
Displays the graph and draws a line using the
formula
Note: Regraphing erases all drawn items.
DropDown
CATALOG
titleString
DropDown
varName
Displays a drop-down menu with the name
titleString
item2String
2:
within a
If
varName
the range of items, the referenced item is
displayed as the default selection. Otherwise, the
menu's first item is the default selection.
When you select an item from the menu, the
corresponding number of the item is stored in the
variable
creates
DrwCtour
CATALOG
expression
DrwCtour
list
DrwCtour
Draws contours on the current 3D graph at the z
values specified by
graphing mode must already be set.
automatically sets the graph format style to
CONTOUR LEVELS
By default, the graph automatically contains the
number of equally spaced contours specified by
the
ncontour
draws contours in addition to the defaults.
To turn off the default contours, set
zero, either by using the Window screen or by
storing 0 to the
180
y1 slope
,
.
yì y1=slopeø (xì x1)
item1String item2String
, { ,
and containing the items
, and so forth.
DropDown
block.
Dialog...EndDlog
already exists and has a value within
. (If necessary,
varName
.)
varName
or
expression
.
Window variable.
system variable.
ncontour
In function graphing mode and
window:
DrawSlp 2,3,ë 2 ¸
See
, ...},
,
item1String
1:
must be
DropDown
In 3D graphing mode:
(1/5)x^2+(1/5)y^2ì 10!z1(x,y)
¸
. The 3D
list
L10!xmin:10!xmax ¸
DrwCtour
L10!ymin:10!ymax ¸
L10!zmin:10!zmax ¸
0!ncontour ¸
DrwCtour {L9,L4.5,L3,0,4.5,9}
¸
DrwCtour
to
ncontour
• Use the cursor to change the viewing
• Press
Appendix A: Functions and Instructions
program listing example.
Dialog
angle. Press 0 (zero) to return to the
original view.
To toggle between different graph format
styles, press:
@
Í
H
F
, , or to look down the
X Y Z
corresponding axis.
ZoomStd
Done
10
10
10
0