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

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Fred
Fred 2014-9-18
回答： Anne van Rossum 2016-6-29
Is there any difference between
rand(n,1)
and
unifrnd(0, 1, n, 1)?

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Youssef Khmou
Youssef Khmou 2014-9-18
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
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Anne van Rossum
Anne van Rossum 2016-6-29
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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