Random number generator – HP 15c User Manual

Page 48

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48

Section 4: Statistics Functions

How many different four-card hands can be dealt from a deck of 52 cards?

Keystrokes

Display

52 v 4

4

Fifty-two (y) cards dealt four
(x) at a time.

|c

270,725.0000

Number of different hands
possible.

The maximum size of x or y is 9,999,999,999.

Random Number Generator

Pressing ´# (random number) will generate a random number
(part of a uniformly distributed pseudo-random number sequence) in the
range 0 ≤ r <1.

*

At initial power-up (including reset of Continuous Memory), the HP-15C
random number generator will use zero as a ―seed‖ to initiate a random
number sequence. Any time you generate a random number, that number
becomes the seed for the next random number. You can initiate a different
random number sequence by storing a new seed for the random number
generator. (Repetition of a random number seed will produce repetition of
the random number sequence.)

O´# will store the X-register number (0 ≤ r < 1) as a new seed
for the random number generator. (A value for r outside this range will be
converted to fit within the range.)

l´# will recall to the display the current random number seed.

Keystrokes

Display

.5764

0.5764

Stores 0.5764 as random number seed.

(The ´ keystroke may be omitted.)


#

0.5764

´#

0.3422

Random number sequence initiated by the
above seed.

´#

0.2809

0.0000

*

Passes the spectral test (D. Knuth, The Art of Computer Programming. Vol. 2. Seminumerical Algorithms,

Third Edition, 1998).

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