Is there any difference between rand(n,1) and unifrnd(0, 1, n, 1)?

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Is there any difference between
rand(n,1)
and
unifrnd(0, 1, n, 1)?

Risposta accettata

Youssef  Khmou
Youssef Khmou il 18 Set 2014
They both generate sample from uniform distribution, unifrnd offers a possibility to enter the parameters while with rand you need to adjust them, example of uniform distribution of interval [5,10] with size of 400 :
h1=unifrnd(5,10,1,400);
h2=5+5*rand(1,400); % same pdf
  3 Commenti
Image Analyst
Image Analyst il 19 Set 2014
I find no unifrnd in base MATLAB, yet no toolbox is listed above.

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Più risposte (1)

Anne van Rossum
Anne van Rossum il 29 Giu 2016
There is less error checking in rand, which can be at times preferred... For example, if you need to generated random numbers between a and b, and it doesn't matter if a > b.
a = 5
b = -5
Then:
a+(b-a)*rand(1,400)
But you'll need to make sure a and b are properly ordered for unifrnd:
if (b < a)
[a, b] = deal(b, a);
end
unifrnd(a,b,1,400)
Or else your result will be a vector of NaNs.

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