Texas Instruments Titanium TI-89, Руководство пользователя

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Appendix A: Functions and Instructions 827
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
o 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.] 4 Polar ¸
[x,y] 4 Polar ¸
complexValue
4
Polar
Displays
complexVector
in polar form.
•
Degree angle mode returns (r
o 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
o q
)
polar entry.
In Radian angle mode:
3+4 i 4 Polar ¸ e
i
ø
(
p
2
ì tan ê (3/4))
ø 5
(4 o p /3) 4 Polar ¸ e
i
ø p
3
ø 4
In Degree angle mode:
3+4
i 4
Polar
¸
(5
o
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}
PopUp
CATALOG
PopUp
itemList
,
var
Displays a pop-up menu containing the character
strings from
itemList
, waits for you to select an item,
and stores the number of your selection in
var
.
The elements of itemList must be character strings:
{ item1String , item2String ,
item3String
, ...}
If
var
already exists and has a valid item number,
that item is displayed as the default choice.
itemList
must contain at least one choice.
PopUp
{"1990","1991","1992"},var1
¸