MATLAB: Randn

randnunifrnd

Hi I have an 20X20 image and I want to distribute 'N' random numbers inside the frame.

How can I use randn for that?

I can use unifrnd(1,20,1,N), but how to use randn?

Thanks

Best Answer

You cannot do that. randn() is the random number generator for the normal distribution. The normal distribution must have infinite tails on both sides, so it is not possible to confine it to any particular range (not and keep it normally distributed.)

You could use a beta distribution to give specific limits, but not a normal distribution.

Related Solutions

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

MATLAB: Independence in rand function

In a strict sense 'rand' is totally deterministic, since it depends entirely on the seed value with which it starts, and cannot therefore be regarded as a valid stochastic process in a theoretical sense. However, the complex algorithm underlying 'rand' is so designed that it gives the appearance of probabilistic independence and uniformity of distribution for its successive values, at least as far as many ordinary tests of such independence are concerned, such as autocorrelation, joint distributions, mean values, standard deviations, histograms, and the like. Most users of matlab, including myself, therefore use 'rand' as if it generates a sequence of truly probabilistically independent values with a uniform density on (0,1), and we appear to obtain satisfactory results.

Best Answer

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MATLAB: Randn

MATLAB: Independence in rand function

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