[R] vector creation

[David Winsemius]

On Jul 31, 2010, at 10:21 AM, Berend Hasselman wrote:

>
>
> On 31-07-2010, at 16:12, alekk [via R] wrote:
>
>> sorry for being unclear:
>> my function func() is actually more complicated than that, and uses  
>> random numbers to generate its result. If I run something like
>>     vect = rep(func(), N)
>> I will get something like (x,x,x, ... ,x).
>>
>> What is the right way to do that ?
>
> There is no single "right" way.
> You can use a for loop.
>
> Have a look at sapply.
>
> ?sapply

While he is at that help page, the OP may want to look at the  
replicate function as well. Perhaps:

vect <- replicate(N, func() )  # which is also a use of sapply


>
> For example:
>
> f <- function(x) 2*x+3
> sapply(1:5,f)
>
> But if your function does not use the input argument then sapply may  
> be overkill.
>
>

David Winsemius, MD
West Hartford, CT