Please note that the recommended version of Scilab is 2025.0.0. This page might be outdated.
See the recommended documentation of this function
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
bym2
.- rand(m1,m2,..,mn)
is a random matrix of dimension
m1
bym2
,.. bymn
.- rand(a)
is a random matrix of same size as a.
rand(a)
is complex ifa
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 defaultn=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)
<< ones | Elementary matrices | sub2ind >> |