Texas Instruments TI-89 - Page 525

508 Appendix A: Functions and Instructions
8992APPA.DOC TI-89 / TI-92 Plus: Appendix A (US English) Susan Gullord Revised: 02/23/01 1:48 PM Printed: 02/23/01 2:21 PM Page 508 of 132
string()
MATH/String menu
string(
expression
)
⇒
string
Simplifies
expression
and returns the result as
a character string.
string(1.2345)
¸
"1.2345"
string(1+2)
¸
"3"
string(cos(x)+‡(3))
¸
"cos(x) +
‡
(3)"
Style
CATALOG
Style
equanum, stylePropertyString
Sets the system graphing function
equanum
in
the current graph mode to use the graphing
property
stylePropertyString
.
equanum
must be an integer from 1–99 and
the function must already exist.
stylePropertyString
must be one of: "
Line
",
"
Dot
", "
Square
", "
Thick
", "
Animate
", "
Path
",
"
Above
", or "
Below
".
Note that in parametric graphing, only the
xt
half of the pair contains the style
information.
Valid style names vs. graphing mode:
Function: all styles
Parametric/Polar: line, dot, square, thick,
animate, path
Sequence: line, dot, square, thick
3D: none
Diff Equations: line, dot, square, thick,
animate, path
Note: Capitalization and blank spaces are
optional when entering
stylePropertyString
names.
Style 1,"thick"
¸
Done
Style 10,"path"
¸
Done
Note: In function graphing mode, these
examples set the style of
y1(x)
to
"Thick"
and
y10(x)
to
"Path"
.
subMat()
CATALOG
subMat(
matrix1
[
,
startRow
] [
,
startCol
] [
,
endRow
]
[
,
endCol
]
)
⇒
matrix
Returns the specified submatrix of
matrix1
.
Defaults:
startRow
=1,
startCol
=1,
endRow
=last
row,
endCol
=last column.
[1,2,3;4,5,6;7,8,9]
!
m1
¸




1
2 3
4 5 6
7 8 9
su
b
Mat
(
m
1
,2,
1
,3,2
)
¸
[
4 5
7 8
]
su
b
Mat
(
m
1
,2,2
)
¸
[
5 6
8 9
]
sum()
MATH/List menu
sum(
list
[
, start
[
, end
]])
⇒
expression
Returns the sum of the elements in
list
.
Start
and
end
are optional. They specify a
range of elements.
sum({1,2,3,4,5})
¸
15
sum({a,2a,3a})
¸
6
ø
a
sum(seq(n,n,1,10))
¸
55
sum({1,3,5,7,9},3)
¸
21