Texas Instruments TI-89 Titanium Short User Manual page 246

ShowStat
CATALOG
ShowStat
Displays a dialog box containing the last
computed statistics results if they are still valid.
Statistics results are cleared automatically if the
data to compute them has changed.
Use this instruction after a statistics calculation,
such as
sign()
MATH/Number menu
expression1
sign(
) ⇒
list1
sign(
) ⇒
matrix1
sign(
For real and complex
expression1
Returns 1 if
Returns ë 1 if
sign(0)
; otherwise, it returns itself.
REAL
sign(0)
domain.
For a list or matrix, returns the signs of all the
elements.
simult()
MATH/Matrix menu
coeffMatrix
simult(
Returns a column vector that contains the
solutions to a system of linear equations.
coeffMatrix
the coefficients of the equations.
constVector
(same dimension) as
constants.
Optionally, any matrix element is treated as zero
if its absolute value is less than
is used only if the matrix has floating-point
entries and does not contain any symbolic
variables that have not been assigned a value.
Otherwise,
• If you use ¥ ¸ or set the mode to
Exact/Approx=APPROXIMATE
are done using floating-point arithmetic.
• If
tol
tolerance is calculated as:
5 ë 14 ù max(dim(
E
ù rowNorm(
240
.
LinReg
) ⇒
expression
list
matrix
expression1
/ when
expression1
abs( )
is positive.
expression1
is negative.
expression1
returns „1 if the complex format mode is
represents the unit circle in the complex
) ⇒
constVector [ tol ]
, ,
must be a square matrix that contains
must have the same number of rows
coeffMatrix
tol is ignored.
is omitted or not used, the default
coeffMatrix
coeffMatrix
)
{1,2,3,4,5}! L1 ¸ {1 2 3 4 5}
{0,2,6,10,25}! L2 ¸
TwoVar L1,L2 ¸
ShowStat ¸
sign(ë 3.2) ¸
sign({2,3,4,ë 5}) ¸
, returns
ƒ 0.
expression1
sign(1+abs(x)) ¸
If complex format mode is
sign([ë 3,0,3]) ¸
Solve for x and y:
matrix
simult([1,2;3,4],[1;ë 1]) ¸
The solution is x=ë 3 and y=2.
and contain the
Solve:
. This tolerance
tol
[a,b;c,d]! matx1 ¸
simult(matx1,[1;2]) ¸
, computations
))
Appendix A: Functions and Instructions
{0 2 6 10 25}
{1
:
REAL
[ë 1 „1 1]
x + 2y = 1
3x + 4y = ë 1
ax + by = 1
cx + dy = 2

ë (2ø bì d)

aø dì bø c


aø dì bø c
ë 1.
1 ë 1}
1
1
ë 3
[ ]
2
a b
[ ]
c d



2ø aì c
