how to define a random variable in matlab code?
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回答（2 个）
Azzi Abdelmalek
2013-1-11
编辑：Azzi Abdelmalek
2013-1-11
x=rand
%or
v=rand(3,4)
%or
randi(10,3,4)
Wayne King
2013-1-11
编辑：Wayne King
2013-1-11
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.
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2013-1-11
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