normrnd vs.random
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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
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
2011-6-20
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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