rand - Maple Programming Help

Online Help

All Products    Maple    MapleSim


Home : Support : Online Help : Programming : Random Objects : rand

rand

random number generator

 

Calling Sequence

Parameters

Description

Details

Examples

Compatibility

Calling Sequence

rand(r)

Parameters

r

-

(optional) numeric range or positive integer

Description

• 

With no arguments, the call rand() returns a random integer sampled uniformly from the range 0 to 1012-1.

• 

If the parameter r is an integer range a..b, the call rand(a..b) returns a procedure which, when called, generates random integers in the range a..b.

• 

If r is a numeric range a..b and one of a or b is not an integer, the call rand(a..b) returns a procedure which, when called, generates random floating-point numbers in the range a..b.

• 

If r is a single integer, the call rand(r) is the abbreviated form of rand(0..r-1).

• 

More than one random number generator may be used at the same time, because rand(a..b) returns a Maple procedure. However, since all random number generators use the same underlying random number sequence, calls to one random number generator will affect the random numbers returned from another.

Details

• 

rand calls RandomTools[MersenneTwister][GenerateInteger] or RandomTools[MersenneTwister][NewGenerator] depending on whether or not a number or procedure is to be returned.  It is more efficient to make these calls directly than to call rand.

• 

The random number generator used by rand can be seeded by using the randomize or RandomTools[MersenneTwister][SetState] functions.

• 

The use of the _seed global variable to seed the generator is deprecated.

• 

The algorithm used by rand in Maple versions up to and including 9.5 has been moved into the RandomTools package as RandomTools[LinearCongruence].

• 

To generate more complex Maple objects, the RandomTools[Generate] function can be used.

• 

To sample from non-uniform probability distributions, the Statistics[Sample] function can be used.

Examples

rand

395718860534

(1)

rand

193139816415

(2)

rollrand1..6:

roll

6

(3)

roll

2

(4)

sampleFloatrand1.0..6.0:

sampleFloat

2.323567403

(5)

sampleFloat

1.809094426

(6)

Compatibility

• 

The rand command was updated in Maple 2015.

See Also

combinat

LinearAlgebra[RandomMatrix]

randomize

RandomTools

RandomTools[Generate]

RandomTools[LinearCongruence]

RandomTools[MersenneTwister]

randpoly

Statistics[Sample]