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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})
¸
2
ø
x
ø
y
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(
ë
4/3)
¸ ë
1
ì
1/3
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
¸