Probability Menu

Press {[PROB] to see the PROB (probability) menu shown, in the following table. It has functions to calculate combinations and permutations, to generate seeds for random numbers, and to obtain random numbers from those seeds.

 

PROB Menu

 

 

Menu Label

Description

 

 

{Q, T}

Combinations. Enter n first, then r (nonnegative

 

integers only). Calculates the number of possible sets

 

of n items taken r at a time. No item occurs more than

 

once in a set, and different orders of the same r items

 

are not counted separately.

{Q, T}

Permutations. Enter n first, then r (nonnegative

 

integers only). Calculates the number of possible

 

arrangements of n items taken r at a time. No item

 

occurs more than once in an arrangement, and

 

different orders of the same r items are counted

 

separately.

{SD}

Seed. Stores the number in x as a new seed for the

 

random number generator.

{R}

Random number generator. Generates a random

 

number in the range 0 ≤ x < 1 (The number is part of

 

a uniformly–distributed pseudo–random number

 

sequence. It passes the spectral test of D. Knuth,

 

Seminumerical Algotithims, vol. 2, London: Addison

 

Wesley, 1981.)

 

 

The RANDOM function (executed by pressing {}) uses a seed to generate a random number. Each random number generated becomes the seed for the next random number. Therefore, a sequence of random numbers can be repeated by starting with the same seed. You can store a new seed with the SEED function (executed by pressing { }). If memory is cleared, the seed is reset to zero.

4–12 Real–Number Functions

File name 32sii-Manual-E-0424

 

Printed Date : 2003/4/24

Size : 17.7 x 25.2 cm