Texas Instruments TI-89 - Page 497

480 Appendix A: Functions and Instructions
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 480 of 132
PlotsOff
CATALOG
PlotsOff
[
1
] [
, 2
] [
, 3
]
...
[
, 9
]
Turns off the specified plots for graphing.
When in 2-graph mode, only affects the active
graph.
If no parameters, then turns off all plots.
PlotsOff 1,2,5
¸
Done
PlotsOff
¸
Done
PlotsOn
CATALOG
PlotsOn
[
1
] [
, 2
] [
, 3
]
...
[
, 9
]
Turns on the specified plots for graphing.
When in 2-graph mode, only affects the active
graph.
If you do not include any arguments, turns on
all plots.
PlotsOn 2,4,5
¸
Done
PlotsOn
¸
Done
4
Polar
MATH/Matrix/Vector ops menu
vector
4
Polar
Displays
vector
in polar form [r
q
]. The
vector must be of dimension 2 and can be a
row or a column.
Note:
4
Polar
is a display-format instruction,
not a conversion function. You can use it
only at the end of an entry line, and it does
not update
ans
.
Note: See also
4
Rect
.
[1,3.]
4Polar
¸
[x,y] 4Polar
¸
complexValue
4
Polar
Displays
complexVector
in polar form.
•
Degree angle mode returns (r
q
).
•
Radian angle mode returns r
e
i
q
.
complexValue
can have any complex form.
However, an r
e
i
q
entry causes an error in
Degree angle mode.
Note: You must use the parentheses for an
(r
q
) polar entry.
In Radian angle mode:
3+4
i
4Polar
¸
e
i
ø
(
p
2
ì
tan
ê
(3/4))
ø
5
(4p/3)4Polar
¸
e
i
ø
p
3
ø
4
In Degree angle mode:
3+4
i
4Polar
¸
(590
ì
tan
ê
(3/4))
polyEval()
MATH/List menu
polyEval(
list1
,
expression1
)
⇒
expression
polyEval(
list1
,
list2
)
⇒
expression
Interprets the first argument as the
coefficient of a descending-degree
polynomial, and returns the polynomial
evaluated for the value of the second
argument.
polyEval({a,b,c},x)
¸
a
ø
x
ñ
+
b
ø
x+c
polyEval({1,2,3,4},2)
¸
26
polyEval({1,2,3,4},{2,
ë
7})
¸
{
26
ë
262
}