rand

Uniformly distributed pseudo-random number

Usages

rand

• It returns a uniformly distributed pseudo-random number (scalar) taken from the interval $[0,1]$.

rand(n)

• It returns an n-by-n matrix of uniformly distributed pseudo-random number taken from the interval $[0,1]$.
• n should be a real, non-negative integer scalar. If n is zero, it returns an empty array.

rand(s1,s2,...,sN)

• It returns an array of size [s1, s2, ..., sN], containing uniformly distributed pseudo-random numbers taken from the interval $[0,1]$.
• s1, s2, ..., sN should be real, non-negative integer scalars. If one of s1, s2, ..., sN is zero, it returns an empty array.

rand(sizeVec)

• It returns an array of uniformly distributed pseudo-random numbers taken from the interval $[0,1]$. The array's size is specified by the size vector sizeVec.
• sizeVec should contain real, non-negative integers. If an element of sizeVec is zero, it returns an empty array.

Examples

• Two methods to generate a $3\times 4\times 5$ array of random numbers lying in the interval $[0, 1]$ with uniform probabilities.

Input

r1 = rand(3, 4, 5);
size(r1)
r2 = rand([3 4 5]);
size(r2)

Output

% Output
ans = 
 3.0000   4.0000   5.0000

ans = 
 3.0000   4.0000   5.0000

Discussion

• Since this app's algorithms for generating random numbers and initial states may be different, users should not expect this app and MATLAB to give the same sequences of pseudo-random numbers.