766
Appendix A: Functions and Instructions
ans()
2
±
key
ans()
⇒
value
ans(
integer
)
⇒
value
Returns a previous answer from the Home screen
history area.
integer
, if included, specifies which previous answer
to recall. Valid range for
integer
is from 1 to 99 and
cannot be an expression. Default is 1, the most
recent answer.
To use
ans()
to generate the Fibonacci
sequence on the Home screen, press:
1
¸
1
1
¸
1
2
±
«
2
±
A
0
2
¸
2
¸
3
¸
5
approx()
MATH/Algebra menu
approx(
expression
)
⇒
value
Returns the evaluation of
expression
as a decimal
value, when possible, regardless of the current
Exact/Approx
mode.
This is equivalent to entering
expression
and
pressing
¥
¸
on the Home screen.
approx(
p
)
¸
3.141
...
approx(
list1
)
⇒
list
approx(
matrix1
)
⇒
matrix
Returns a list or matrix where each element has
been evaluated to a decimal value, when possible.
approx({sin(
p
),cos(
p
)})
¸
{0.
ë
1.}
approx([
‡
(2),
‡
(3)])
¸
[1.414
...
1.732
...
]
Archive
CATALOG
Archive
var1 [, var2] [, var3] …
Moves the specified variables from RAM to the user
data archive memory.
You can access an archived variable the same as
you would a variable in RAM. However, you cannot
delete, rename, or store to an archived variable
because it is locked automatically.
To unarchive variables, use
Unarchiv
.
10
!
arctest
¸
10
Archive arctest
¸
Done
5
ù
arctest
¸
50
15
!
arctest
¸
N
Unarchiv arctest
¸
Done
15
!
arctest
¸
15
arcLen()
MATH/Calculus menu
arcLen(
expression1
,
var
,
start
,
end
)
⇒
expression
Returns the arc length of
expression1
from
start
to
end
with respect to variable
var
.
Regardless of the graphing mode, arc length is
calculated as an integral assuming a function mode
definition.
arcLen(cos(x),x,0,
p
)
¸
3.820
...
arcLen(f(x),x,a,b)
¸
⌡
⌠
a
b
(
d
d
x
(f(x)))
ñ
+1
d
x
arcLen(
list1,var,start,end
)
⇒
list
Returns a list of the arc lengths of each element of
list1 from start to end with respect to var.
arcLen({sin(x),cos(x)},x,0,
p
)
{3.820
...
3.820
...
}
augment()
MATH/Matrix menu
augment(
list1,
list2
)
⇒
list
Returns a new list that is
list2
appended to the end
of
list1
.
augment({1,
ë
3,2},{5,4})
¸
{1
ë
3 2 5 4}
Summary of Contents for Titanium TI-89
Page 9: ...Getting Started 6 TI 89 Titanium keys Ë Ì Í Ê ...
Page 34: ...Getting Started 31 2 or D 2 B u s i n e s s D B D B Press Result ...
Page 43: ...Getting Started 40 3 0 D B D D B D Press Result ...
Page 44: ...Getting Started 41 D 2 0 0 2 D B Scroll down to October and press Press Result ...
Page 58: ...Getting Started 55 Example Set split screen mode to TOP BOTTOM Press Result 3 B D ...
Page 70: ...Getting Started 67 ...
Page 175: ...Operating the Calculator 172 From the Keyboard ...
Page 456: ...Tables 453 ...
Page 527: ...Data Matrix Editor 524 ...
