834 Appendix A: Functions and Instructions
R4Pr() MATH/Angle menu
R4Pr (
xExpression
,
yExpression
) ⇒
expression
R4Pr (
xList
,
yList
) ⇒
list
R4Pr (
xMatrix
,
yMatrix
) ⇒
matrix
Returns the equivalent
r
-coordinate of the
(
x,y
) pair arguments.
In Radian angle mode:
R4Pr(3,2)
¸
R4Pr(x,y)
¸
R4Pr([3,-4,2],[0,pà4,1.5])
¸
rand() MATH/Probability menu
rand([
n
]) ⇒
expression
n
is an integer
ƒ
zero.
With no parameter, returns the next random number
between 0 and 1 in the sequence. When an
argument is positive, returns a random integer in the
interval [1,
n
].
When an argument is negative, returns a random
integer in the interval [
ë
n
,
ë
1].
RandSeed 1147
¸ Done
rand()
¸ .158
...
rand(6)
¸ 5
rand(ë 100)
¸ë49
randMat() MATH/Probability menu
randMat(
numRows
,
numColumns
) ⇒
matrix
Returns a matrix of integers between -9 and 9 of the
specified dimension.
Both arguments must simplify to integers.
RandSeed 1147
¸ Done
randMat(3,3)
¸
8 ë 3 6
ë 2 3 ë 6
0 4 ë 6
Note: The values in this matrix will change each
time you press
¸
.
randNorm( ) MATH/Probability menu
randNorm(
mean
,
sd
) ⇒
expression
Returns a decimal number from the specific normal
distribution. It could be any real number but will be
heavily concentrated in the interval [
mean
-3
ù
sd
,
mean
+3
ù
sd
].
RandSeed 1147
¸ Done
randNorm(0,1)
¸ .492
...
randNorm(3,4.5)
¸ ì3.543
...
randPoly() MATH/Probability menu
randPoly(
var
,
order
) ⇒
expression
Returns a polynomial in
var
of the specified order.
The coefficients are random integers in the range
ë
9 through 9. The leading coefficient will not be
zero.
order
must be 0–99.
RandSeed 1147
¸ Done
randPoly(x,5)
¸
ë 2ø x
5
+3ø x
4
ì 6ø x
3
+4ø xì 6
RandSeed MATH/Probability menu
RandSeed
number
If
number
= 0, sets the seeds to the factory defaults
for the random-number generator. If
number
ƒ
0, it is
used to generate two seeds, which are stored in
system variables
seed1
and
seed2
.
RandSeed 1147
¸ Done
rand()
¸ .158
...
(Sets the random-number seed.)
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