MATLAB: Creating a vector randn

gaussianrandnvector

Hi,

I would like to know how to create a 1×301 vector that has Gaussian distribution with 0 mean and some variance sigma. Thanks in advance!

Best Answer

Hi,

This page helps you to solve this.

https://www.mathworks.com/help/matlab/math/random-numbers-with-specific-mean-and-variance.html?s_tid=answers_rc2-3_p6_Topic

As stated in the page

y = sqrt(variance).*randn(1,301) + mean;
% As mean is 0, variance is sigma
sigma = 5;
mean = 0;
y = sqrt(sigma).*randn(1,301) + mean;

Hope this helps.

Regards,

Sriram

Related Solutions

MATLAB: Hi – please what is the difference between normrnd and randn

1. what is the difference between normrnd and randn?

doc normrnd
 r = normrnd(mu,sigma) generates a random number from the normal distribution with mean
 parameter mu and standard deviation parameter sigma.
doc randn
 X = randn returns a random scalar drawn from the standard normal distribution.

"Standard normal distribution" is a mean of 0.0 and a standard deviation of 1.0 . This means:

normrnd(mu, sigma) = randn * sigma + mu

2. How to use normrnd to generate random numbers from normal distribution with specific mean and variance ?

Simply by calling: normrnd(mu, sigma)

Remember that normrnd uses the standard deviation, which is the square root of the variance.

Do you know the doc and help commands? You find the documentation of the current Matlab version online also: https://www.mathworks.com/help/index.html

MATLAB: Randn

Your question is not really clear ... how about

x = mod(randn(2, 100)+10, 20)

You maybe you mean ...

x = 10*randn(2, 100)+10;
while any(x(:) > 20)
  x(x(:) > 20) = 10*randn(sum(x(:) > 20), 1)+10;
end

Best Answer

Related Solutions

MATLAB: Hi – please what is the difference between normrnd and randn

MATLAB: Randn

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