HP HP-11C User Manual

54 Section 3: Numeric Functions
Example
To Calculate Keystrokes Display
Permutation
Example: 10 items in
arrangements of 3 at
atime. 10 ([ENTER 10.0000
3 720.0000
Combination
Example: 10 items in
sets of 3 at atime. 10 [ENTER 10.0000
3 120.0000
Statistics Functions
Random Number Generator
The HP-11C’s random number generator uses either an auto-
matically stored seed (zero), or a seed you key in, to initiate a
uniformly distributed pseudo-random number sequence in the
range 0 <r <1.* Because of Continuous Memory, the sequence will
continue until a new initial seed is stored.
Random Number Seed. To initiate a new random number
sequence at any time, place a new seed in the random number
generator by keying in any number 0 < n <1' and pressing
(RAN#]. To generate a random number, simply press [f][RAN#]. The
new random number will appear in the displayed X-register. ([f]
affects the stack in the same way as recalling a number from
a storage register.) The newly generated random number also
becomes the seed for the next random number in the current
sequence. Whenever Continuous Memory is reset, or when a power
failure occurs, the random number seed is set to zero. (Repeated use
of the same value for a random number seed will produce
repetitions of the same random number sequence.)
* Passes the spectral test (Knuth, Vol. 2).
t If a number whose magnitude is > 1 is used as a seed, the decimal point in the stored
version of the number will be shifted to the left of the first significant digit. For example,
123.0, 12.3, and 0.123 would all be stored as 0.123 by [STO](f][RAN#].

HP HP-11C Specifications

General

Brand	HP
Model	HP-11C
Category	Calculator
Language	English