Texas Instruments Titanium TI-89, Руководство пользователя

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Appendix A: Functions and Instructions 835
RclGDB
CATALOG
RclGDB GDBvar
Restores all the settings stored in the Graph
database variable
GDBvar
.
For a listing of the settings, see
StoGDB
.
Note: It is necessary to have something saved in
GDBvar
before you can restore it.
RclGDB GDBvar
¸
Done
RclPic
CATALOG
RclPic picVar [ , row , column ]
Displays the Graph screen and adds the picture
stored in
picVar
at the upper left-hand corner pixel
coordinates (
row
,
column
) using OR logic.
picVar
must be a picture data type.
Default coordinates are (0, 0).
real()
MATH/Complex menu
real(
expression1
)
⇒
expression
Returns the real part of the argument.
Note: All undefined variables are treated as real
variables. See also
imag()
.
real(2+3 i ) ¸ 2
real(z)
¸
z
real(x+ i y) ¸ x
real(
list1
)
⇒
list
Returns the real parts of all elements.
real({a+ i ù b,3, i }) ¸ {a 3 0}
real(
matrix1
)
⇒
matrix
Returns the real parts of all elements.
real([a+ i
ù
b,3;c, i ])
¸ [
a 3
c 0
]
4
Rect
MATH/Matrix/Vector ops menu
vector 4
Rect
Displays
vector
in rectangular form [x, y, z]. The
vector must be of dimension 2 or 3 and can be a
row or a column.
Note :
4
Rect
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
Polar
.
[3,
o p à
4,
o p à
6]
4
Rect
¸
[
3
ø ‡
2
4
3
ø ‡
2
4
3
ø ‡
3
2
]
[a,
o
b,
o
c]
¸
[a
ø
cos(b)
ø
sin(c)
a
ø
sin(b)
ø
sin(c) a
ø
cos(c)]
complexValue 4
Rect
Displays
complexValue
in rectangular form a+b i . The
complexValue
can have any complex form. However,
an r e
i q
entry causes an error in Degree angle mode.
Note : You must use parentheses for an (r
o q
) polar
entry.
In Radian angle mode:
4 e ^(
p
/3)
4
Rect
¸
4
ø
e
p
3
(4
o p
/3)
4
Rect
¸
2+2
ø
3
ø
i
In Degree angle mode:
(4
o
60)
4
Rect
¸
2+2
ø
3
ø i
Note: To type
4
Rect
from the keyboard, press
2
p
for the
4
operator. To type
o
, press
2
’
.