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# rand

random number generator

### Calling Sequence

rand(m1,m2,.. [,key]) rand(x [, key]) rand() rand(key) rand("seed" [,n]) rand("info")

### Arguments

- mi
integers

- key
character string with value in

`"uniform"`

,`"normal"`

- x
a matrix. Only its dimensions are taken into account.

### Description

random matrix generator.

Warning: without a seed, the sequence will remain the same from a session to the other.

At the beginning of each script using rand function, you should use:

rand('seed',getdate('s'))

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)

## Comments

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