Texas Instruments TI-89 Manual Book page 534

variance()
MATH/Statistics menu
[
variance(list
, freqlist
Returns the variance of
Each
freqlist
consecutive occurrences of the
corresponding element in
Note:
list
variance(matrix1
Returns a row vector containing the variance
of each column in
Each
freqmatrix
of consecutive occurrences of the
corresponding element in
Note:
matrix1
rows.
when()
CATALOG
when(condition, trueResult [, falseResult]
[, unknownResult])
Returns
unknownResult
condition
the input if there are too few arguments to
specify the appropriate result.
Omit both
make an expression defined only in the
region where
Use an
undef falseResult
expression that graphs only on an interval.
Omit only the
piece expression.
]
)
expression
.
list
element counts the number of
.
list
must contain at least two elements.
[ ]
)
, freqmatrix matrix
.
matrix1
element counts the number
matrix1
must contain at least two
expression
, , or
trueResult falseResult
, depending on whether
is true, false, or unknown. Returns
and
falseResult unknownResult
is true.
condition
to define an
to define a two-
unknownResult
variance({a,b,c}) ¸
variance({1,2,5,ë 6,3,ë 2}) ¸
variance({1,3,5},{4,6,2}) ¸
variance([1,2,5;ë 3,0,1;
.5,.7,3]) ¸
variance([L1.1,2.2;3.4,5.1;
L2.3,4.3],[6,3;2,4;5,1]) ¸
.
when(x<0,x+3)|x=5 ¸
to
ClrGraph ¸
Graph when(x‚ë p and
x<0,x+3,undef) ¸
Graph when(x<0,x+3,5ì x^2) ¸
Appendix A: Functions and Instructions
añ -aø (b+c)+bñ -bø c+cñ
3
31/2
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[4.75 1.03
[3.91731,2.08411]
when(x<0,3+x)
4]
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