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862 Appendix A: Functions and Instructions
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 ë6
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
-3ù
sd
,
mean
+3ù
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
ë9 through 9. The leading coefficient will not be
zero.
order
must be 0–99.
RandSeed 1147 ¸ Done
randPoly(x,5)
¸
ë2ø x
5
+3ø x
4
ì 6øx
3
+4ø xì6
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...
RclGDB CATALOG
RclGDB
GDBvar
Restores all the settings stored in the Graph
database variable
GDBvar.
For a listing of the settings, see
StoGDB.
Note: It is necessary to have something saved in
GDBvar before you can restore it.
RclGDB GDBvar ¸ Done
RclPic CATALOG
RclPic
picVar
[,
row
,
column
]
Displays the Graph screen and adds the picture
stored in
picVar
at the upper left-hand corner pixel
coordinates (
row
,
column
) using OR logic.
picVar
must be a picture data type.
Default coordinates are (0, 0).
real() MATH/Complex menu
real(
expression1
) ⇒
⇒⇒
⇒
expression
Returns the real part of the argument.
Note: All undefined variables are treated as real
variables. See also
imag().
real(2+3
i
) ¸ 2
real(z)
¸ z
real(x+iy)
¸ x