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

12 Ansichten (letzte 30 Tage)
Is there any difference between
rand(n,1)
and
unifrnd(0, 1, n, 1)?

Akzeptierte Antwort

Youssef  Khmou
Youssef Khmou am 18 Sep. 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 Kommentare
Image Analyst
Image Analyst am 19 Sep. 2014
I find no unifrnd in base MATLAB, yet no toolbox is listed above.

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Weitere Antworten (1)

Anne van Rossum
Anne van Rossum am 29 Jun. 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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