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normrnd vs.random

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Andrea
Andrea el 20 de Jun. de 2011
Comentada: dany katamba mpoyi el 11 de Jun. de 2022
Dear, I would like to generate random nmbers with a normal distribution. From the documentation I see that there are two functioncs that seem to make the same things. normrnd(mu,sigma) and random('Normal',mu,sigma)
I wrote these two simpole for-loop in order to evaluate time consumption of these two functions and I found that normrnd is less time-consuming than random. I don't understand this difference. Could you help me?
tic for i=1:1000000 ciao=ciao+normrnd(0,0.01); end toc
tic for i=1:1000000 ciao=ciao+random('Normal',0,0.01); end toc
Kind regards
Andrea Giostri

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Titus Edelhofer
Titus Edelhofer el 20 de Jun. de 2011
Hi,
if you open random with an editor and search for "normrnd", you will see, that random in fact calls normrnd. That's why it takes a little more time. On the other hand: if you call normrnd and random one time with N=1000000 instead of N calls in a loop, it won't make a difference at all ...
Titus
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Andrew Newell
Andrew Newell el 20 de Jun. de 2011
Aaagh! Right at the top of http://www.mathworks.com/matlabcentral/answers/1759-dumb-mistakes-we-make-with-matlab! Thanks for reminding me.

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