normrnd vs.random

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Andrea 2011-6-20

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评论： dany katamba mpoyi 2022-6-11

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 2011-6-20

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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