Texas Instruments TI-89 Titanium Short User Manual page 238

rref()
MATH/Matrix menu
matrix1 [
rref( ,
Returns the reduced row echelon form of
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:
ë 14 ù max(dim(
5
E
ù rowNorm(
Note: See also
sec()
MATH/Trig menu
expression1
sec(
) ⇒
list1 list
sec(
Returns the secant of
containing the secants of all elements in
Note: The argument is interpreted as either a
degree or radian angle, according to the current
angle mode.
L1
sec ()
MATH/Trig menu
expression1
L1
sec (
) ⇒
list1
L1
sec (
Returns the angle whose secant is
returns a list containing the inverse secants of
each element of
Note: The result is interpreted as either a degree
or radian angle, according to the current angle
mode.
sech()
MATH/Hyperbolic menu
expression1
sech(
) ⇒
list1
sech(
Returns the hyperbolic secant of
returns a list containing the hyperbolic secants of
list1
the
232
) ⇒
tol ] matrix
is ignored.
tol
is omitted or not used, the default
matrix1
))
matrix1
)
.
ref()
) ⇒
expression
expression1
) ⇒
expression
list
list1
.
) ⇒
expression
list
elements.
rref([ë 2,ë 2,0,ë 6;1,ë 1,9,ë 9;
ë 5,2,4,ë 4]) ¸
.
matrix1
rref([a,b,x;c,d,y]) ¸
. This tolerance
tol
, computations
In Degree angle mode:
sec(45) ¸
or returns a list
list1
.
sec({1,2.3,4}) ¸
In Degree angle mode:
sec
expression1 or
In Radian angle mode:
sec
sech(3) ¸
expression1
or
sech({1,2.3,4}) ¸
Appendix A: Functions and Instructions

1 0

0 1


0 0

1 0


0 1

1
1.000...
cos(1)
L1
(1) ¸
L1
({1,2,5}) ¸
0
1
.198...
cosh(1)

0 66/71

147
0

71

ë 62/71
1

dø x-bø y

aø d-bø c

ë (cø x-aø y)

aø d-bø c
(2)
1
cos(4)
0
p
L1
3 cos (1/5)
1
cosh(3)
1
cosh(4)