how to define a random variable in matlab code?

how to define random variable in matlab..

Answer 1

[Azzi Abdelmalek]

 x=rand

%or

v=rand(3,4)

%or

randi(10,3,4)

Answer 2

[Wayne King]

That depends what you mean.

Generally what you mean is that you want some way of sampling from some probability law (distribution).

In that case, you use a random number generator to generate numbers that follow a particular distribution.

For example:

Uniform distribution on [-\pi, \pi]

    x = -pi +2*pi*rand(1000,1);
    hist(x)

Base MATLAB has random number generators for uniform and Gaussian random variables (randn) and random integers (randi)

The Statistics Toolbox has random number generators for a large number of common distributions.

With some ingenuity, you can use the uniform random number generator to model a large set of random variables.