Saturday, January 28, 2012

What is the difference between rand and randn in MATLAB ?

We have two functions in MATLAB namely rand() and randn() to generate random numbers.  There exists a small difference between these two which lets us easy to use but complex to understand.

rand gives value from standard uniform distribution. That is they are in range [0,1].

randn gives value from standard normal distribution. A distribution with mean 0 and variance 1 is nothing but Standard Uniform Distribution. These are also in range [0,1]

In general we will use randn for generating random numbers.

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  1. Not true:


    ans =

    1.6035 -0.2296
    1.2347 -1.5062