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}) ¸6øa
sum(seq(n,n,1,10)) ¸55
sum({1,3,5,7,9},3) ¸21