Texas Instruments TI-89 Titanium Short User Manual page 222

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P4Rx()
MATH/Angle menu
rExpression
P4Rx(
rList
List
P4Rx(
, q
rMatrix
P4Rx(
, q
Returns the equivalent x-coordinate of the
(r, q) pair.
Note: The q argument is interpreted as either a
degree or radian angle, according to the current
angle mode. If the argument is an expression, you
can use ó or ô to override the angle mode setting
temporarily.
P4Ry()
MATH/Angle menu
rExpression
P4Ry(
rList
, q
List
P4Ry(
rMatrix
P4Ry(
, q
Returns the equivalent y-coordinate of the
(r, q) pair.
Note: The q argument is interpreted as either a
degree or radian angle, according to the current
angle mode. If the argument is an expression, you
can use ó or ô to override the angle mode setting
temporarily.
part()
CATALOG
expression1
part(
This advanced programming function lets you
identify and extract all of the sub-expressions in
the simplified result of
For example, if
cos(pù x+3):
• The
(pù x+3).
• The sum of (pù x+3) has two operands: pù x
and 3.
• The number 3 has no arguments or operands.
• The product pù x has two operands: p and x.
• The variable x and the symbolic constant p
have no arguments or operands.
If x has a numeric value and you press
the numeric value of pù x is calculated, the result
is added to 3, and then the cosine is calculated.
cos()
applied last.
expression1
part(
Simplifies
top-level arguments or operands. This returns 0 if
expression1
constant such as p,
expression1
part(
Simplifies
contains the top-level function name or operator.
This returns
number, variable, or symbolic constant such as p,
e
i
, or ˆ.
,
216
) ⇒
, q
Expression
expression
) ⇒
list
) ⇒
Matrix
matrix
) ⇒
Expression
expression
, q
) ⇒
list
) ⇒
Matrix
matrix
nonNegativeInteger
[
]
,
)
expression1
simplifies to
expression1
function has one argument:
cos()
is the top-level operator because it is
) ⇒
number
and returns the number of
expression1
is a number, variable, or symbolic
e
i
, or ˆ.
,
, 0) ⇒
string
and returns a string that
expression1
expression1
string(
In Radian angle mode:
P4Rx(r,q) ¸
P4Rx(4,60¡) ¸
P4Rx({ë 3,10,1.3},{p/3,ë p/4,0})
¸
In Radian angle mode:
P4Ry(r,q) ¸
P4Ry(4,60¡) ¸
P4Ry({ë 3,10,1.3},{p/3,ë p/4,0})
¸
.
,
¥ ¸
part(cos(pù x+3)) ¸
Note: cos(pù x+3) has one argument.
part(cos(pù x+3),0) ¸
if
is a
expression1
)
Appendix A: Functions and Instructions
cos(q)ø r
{
ë 3/2
5ø ‡2
sin(q)ø r
ë 3ø ‡3
{
ë 5ø ‡2
2
2
}
1.3
2ø ‡3
}
0.
1
"cos"

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