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Appendix A: Functions and Instructions 441
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 441 of 132
DrwCtour
CATALOG
DrwCtour
expression
DrwCtour
list
Draws contours on the current 3D graph at
the z values specified by
expression
or
list
.
The 3D graphing mode must already be set.
DrwCtour
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
Window variable.
DrwCtour
draws contours in addition to the
defaults.
To turn off the default contours, set
ncontour
to zero, either by using the Window screen or
by storing 0 to the
ncontour
system variable.
In 3D graphing mode:
(1/5)x^2+(1/5)y^2
ì
10
!
z1(x,y)
¸
Done
L10
!
xmin:10
!
xmax
¸
10
L10
!
ymin:10
!
ymax
¸
10
L10
!
zmin:10
!
zmax
¸
10
0
!
ncontour
¸
0
DrwCtour {L9,L4.5,L3,0,4.5,9}
¸
•
Use the cursor to change the viewing
angle. Press 0 (zero) to return to the
original view.
•
To toggle between different graph
format styles, press:
TI
-
89
:
Í
TI
-
92 Plus
: F
•
Press X, Y, or Z to look down the
corresponding axis.
í
TI
-
89
:
^
key TI
-
92 Plus:
2^
key
mantissa
E
exponent
Enters a number in scientific notation. The
number is interpreted as
mantissa
×
10
exponent
.
Hint: If you want to enter a power of 10
without causing a decimal value result, use
10^
integer
.
2.3
í
4
¸
23000.
2.3
í
9+4.1
í
15
¸
4.1
í
15
3
ù
10^4
¸
30000
e
^()
TI
-
89
:
¥
s
key TI
-
92 Plus:
2s
key
e
^(
expression1
)
⇒
expression
Returns
e
raised to the
expression1
power.
Note: On the TI
-
89, pressing
¥
s
to
display e^( is different from pressing
j
[E].
On the TI
-
92 Plus, pressing
2s
to display e^ is different from accessing the
character e from the QWERTY keyboard.
You can enter a complex number in
r
e
i
q
polar
form. However, use this form in Radian angle
mode only; it causes a
Domain error
in Degree
angle mode.
e
^(1)
¸
e
e
^(1.)
¸
2.718
...
e
^(3)^2
¸
e
9
e
^(
list1
)
⇒
list
Returns
e
raised to the power of each
element in
list1
.
e
^({1,1.,0,.5})
¸
{
e
2.718
...
1 1.648
...
}