rand - random number generator

Calling Sequence

rand(m1,m2,.. [,key])

rand(x [, key])

rand()

rand(key)

rand("seed" [,n])

rand("info")

Parameters

• mi : integers
• key : character string with value in "uniform" , "normal"
• x : a matrix. Only its dimensions are taken into account.

Description

random matrix generator.

Without key argument the syntaxes below produce random matrices with the current random generator (default is "uniform")

rand(m1,m2) is a random matrix of dimension m1 by m2 .

rand(m1,m2,..,mn) is a random matrix of dimension m1 by m2 ,.. by mn .

rand(a) is a random matrix of same size as a. rand(a) is complex if a is a complex matrix.

rand() : with no arguments gives a scalar whose value changes each time it is referenced.

If present, the key argument allows to specifie an other random distribution.

rand('uniform') The current random generator is set to a uniform random generator. Random numbers are uniformly distributed in the interval (0,1).

rand('normal') The current random generator is set to a Gaussian (with mean 0 and variance 1) random number generator.

str=rand('info') return the type of the default random generator ('uniform' or 'normal')

IT is possible to (re-)initialize the seed of the rand generator:

rand('seed') returns the current value of the seed.

rand('seed',n) puts the seed to n . (by default n=0 at first call).

Remark

Use the more powerful function grand instead.

Examples

x=rand(10,10,'uniform')
rand('normal')
rand('info')
y=rand(x,'normal');
x=rand(2,2,2)
 
  

See Also

grand ,   ssrand ,