Appendix A: Functions and Instructions
865
unitV()
MATH/Matrix/Vector ops menu
unitV(
vector1
)
⇒
vector
Returns either a row- or column-unit vector,
depending on the form of
vector1
.
vector1
must be either a single-row matrix or a
single-column matrix.
unitV([a,b,c])
¸
[
a
a
ñ
+b
ñ
+c
ñ
b
a
ñ
+b
ñ
+c
ñ
c
a
ñ
+b
ñ
+c
ñ
]
unitV([1,2,1])
¸
[
‡
6
6
‡
6
3
‡
6
6
]
unitV([1;2;3])
¸
‡
14
14
‡
14
7
3
ø
‡
14
14
Unlock
CATALOG
Unlock
var1[, var2][, var3]
...
Unlocks the specified variables.
Note:
The variables can be locked using the
Lock
command.
variance()
MATH/Statistics menu
variance(
list
[
, freqlist
]
)
⇒
expression
Returns the variance of
list
.
Each
freqlist
element counts the number of
consecutive occurrences of the corresponding
element in
list
.
Note:
list
must contain at least two elements.
variance({a,b,c})
¸
a
ñ
-
a
ø
(b+c)+b
ñ
-
b
ø
c+c
ñ
3
variance({1,2,5,
ë
6,3,
ë
2})
¸
31/2
variance({1,3,5},{4,6,2})
¸
68/33
variance(
matrix1
[
, freqmatrix
]
)
⇒
matrix
Returns a row vector containing the variance of
each column in
matrix1
.
Each
freqmatrix
element counts the number of
consecutive occurrences of the corresponding
element in
matrix1
.
Note:
matrix1
must contain at least two rows.
variance([1,2,5;
ë
3,0,1;
.5,.7,3])
¸
[4.75 1.03 4]
variance([
L
1.1,2.2;3.4,5.1;
L
2.3,4.3],[6,3;2,4;5,1])
¸
[3.91731,2.08411]
when()
CATALOG
when(
condition
,
trueResult
[,
falseResult
]
[,
unknownResult
]
)
⇒
expression
Returns
trueResult
,
falseResult
, or
unknownResult
,
depending on whether
condition
is true, false, or
unknown. Returns the input if there are too few
arguments to specify the appropriate result.
Omit both
falseResult
and
unknownResult
to make an
expression defined only in the region where
condition
is true.
when(x<0,x+3)|x=5
¸
when(x<0,3+x)
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 ...
