R help - Apr 2009 - splitting vector into equal sets

Hi R,

I have explored R archives a lot but couldn't find an efficient way of 
doing the following:

I want to split a vector into sets of equal sizes. Is there any inbuilt 
function of doing so with the option of specifying how to treat the 
remaining observations. For example: suppose I want to split 20 
observations in 3 groups, then I also want the option to put the extra 
two observations into the 1st group or the last group or one in each 
group starting from 1st or starting from last.

I have already tried the "cut" & the "quantcut" function
but of no use.
Any help will be appreciated. Note that I am looking for an R function 
rather than lines of code.

Regards
Utkarsh

Hi

r-help-bounces at r-project.org napsal dne 16.04.2009 15:23:15:
> Hi R,
> 
> I have explored R archives a lot but couldn't find an efficient way of 
> doing the following:
> 
> I want to split a vector into sets of equal sizes. Is there any inbuilt 
> function of doing so with the option of specifying how to treat the 
> remaining observations. For example: suppose I want to split 20 
> observations in 3 groups, then I also want the option to put the extra 
> two observations into the 1st group or the last group or one in each 
> group starting from 1st or starting from last.
> 
> I have already tried the "cut" & the "quantcut"
function but of no use.
> Any help will be appreciated. Note that I am looking for an R function 
> rather than lines of code.
Did you try split?
e.g.
split(rnorm(12), rep(1:3,4))
gives list with 3 vectors. Then you can use lapply, sapply or other list 
functions to make some computation.

Or I could be completely wrong what you really want as you did not provide 
any example.

Regards
Petr

> 
> Regards
> Utkarsh
> 
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