[R] Sampling of non-overlapping intervals of variable length

[Hadassa Brunschwig]

Hi

I am not sure what you mean by sampling an index of a group of
intervals. I will try to give an example:
Let's assume I have a vector 1:1000000. Let's say I have 10 intervals
of different but known length, say,
c(4,6,11,2,8,14,7,2,18,32). For simulation purposes I have to sample
those 10 intervals 1000 times.
The requirement is, however, that they should be of those lengths and
should not be overlapping.
In short, I would like to obtain a 10x1000 matrix with sampled intervals.

Thanks
Hadassa

On Sun, Jul 19, 2009 at 9:48 PM, David Winsemius<dwinsemius at comcast.net> wrote:
>
> On Jul 19, 2009, at 1:05 PM, Hadassa Brunschwig wrote:
>
>> Hi,
>>
>> I hope I am not repeating a question which has been posed already.
>> I am trying to do the following in the most efficient way:
>> I would like to sample from a finite (large) set of integers n
>> non-overlapping
>> intervals, where each interval i has a different, set length L_i
>> (which is the number
>> of integers in the interval).
>> I had the idea to sample recursively on a vector with the already
>> chosen intervals
>> discarded but that seems to be too complicated.
>
> It might be ridiculously easy if you sampled on an index of a group of
> intervals.
> Why not pose the question in the form of example data.frames or other
> classes of R objects? Specification of the desired output would be
> essential. I think further specification of the sampling strategy would also
> help because I am unable to understand what sort of probability model you
> are hoping to apply.
>
>> Any suggestions on that?
>>
>> Thanks a lot.
>>
>> Hadassa
>>
>>
>> --
>> Hadassa Brunschwig
>> PhD Student
>> Department of Statistics
>
>
> David Winsemius, MD
> Heritage Laboratories
> West Hartford, CT
>
>



-- 
Hadassa Brunschwig
PhD Student
Department of Statistics
The Hebrew University of Jerusalem
http://www.stat.huji.ac.il