Re: [R] Alternate to for-loop

[Patrick Burns]

If the goal is to "look" professional, then
'replicate' probably suits.  If the goal is to
compute as fast as possible, then that isn't
the case because 'replicate' is really a 'for'
loop in disguise and there are other ways.
Here's one other way:

function (size, replicates, distfun, ...)
{

       colMeans(array(distfun(size * replicates, ...), c(size, 
replicates)))
}



Patrick Burns
patr...@burns-stat.com
+44 (0)20 8525 0696
http://www.burns-stat.com
(home of "The R Inferno" and "A Guide for the Unwilling S User")

Uwe Ligges wrote:


megh wrote:
No, it is not homework. I obviously


For some value of "obvious" as you has not given a single line of code 
as the posting guide suggests.

You probably want:

replicate(10, mean(rnorm(100)))

Uwe Ligges


could do that using a for-loop, and that
I already did. However I thought whether there could be a better 
approach as
it was looking very messy and unprofessional.



Uwe Ligges-3 wrote:


megh wrote:
Hi, I am trying to create a vector of length 10 (say), wherein each
element
will be average of random sample of size 100, from a distribution, say
Normal. Can anyone please tell me without creating a "for" loop, how I
can
do that?

Homework? Then please ask you course material or teacher.

PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

Uwe Ligges

Regards,


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and provide commented, minimal, self-contained, reproducible code.



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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.