482 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 482 of 132
product() MATH/List menu
product(list[, start[, end]]) ⇒ expression
Returns the product of the elements
contained in list. Start and end are optional.
They specify a range of elements.
product({1,2,3,4}) ¸24
product({2,x,y}) ¸2øxøy
product({4,5,8,9},2,3) ¸40
product(matrix1[, start[, end]]) ⇒ matrix
Returns a row vector containing the products
of the elements in the columns of matrix1.
Start and end are optional. They specify a
range of rows.
product([1,2,3;4,5,6;7,8,9])
¸[28 80 162]
product([1,2,3;4,5,6;7,8,9],
1,2) ¸[4,10,18]
Prompt CATALOG
Prompt var1[, var2] [, var3] ...
Displays a prompt on the Program I/O screen
for each variable in the argument list, using
the prompt var1?. Stores the entered
expression in the corresponding variable.
Prompt must have at least one argument.
Program segment:
©
Prompt
A
,B,C
©
En
d
Prgm
propFrac() MATH/Algebra menu
propFrac(expression1[, var]) ⇒ expression
propFrac(rational_number) returns
rational_number as the sum of an integer and
a fraction having the same sign and a greater
denominator magnitude than numerator
magnitude.
propFrac(4/3) ¸1 + 1/3
propFrac(ë4/3) ¸ë1ì1/3
propFrac(rational_expression,var) returns the
sum of proper ratios and a polynomial with
respect to var. The degree of var in the
denominator exceeds the degree of var in the
numerator in each proper ratio. Similar
powers of var are collected. The terms and
their factors are sorted with var as the main
variable.
If var is omitted, a proper fraction expansion
is done with respect to the most main
variable. The coefficients of the polynomial
part are then made proper with respect to
their most main variable first and so on.
For rational expressions, propFrac() is a
faster but less extreme alternative to
expand().
propFrac((x^2+x+1)/(x+1)+
(
y^2+y+
1)/(
y+
1)
,x
)
¸
propFrac(ans(1))
PtChg CATALOG
PtChg x, y
PtChg xList, yList
Displays the Graph screen and reverses the
screen pixel nearest to window coordinates
(x, y).
Note: PtChg through PtText show
continuing similar examples.
PtChg 2,4 ¸