[R] function restrictedparts

[Matt Shotwell]

That's because the number of partitions of 281 items of order 10 is
quite large:

R> library('partitions')
R> R(10,281)
[1] 1218681472

Without thinking about this too hard, the result of
restrictedparts(281,10) should require around

R> 1218681472 * 10 * 4 / 10^9
[1] 48.74726

gigabytes of storage space (because the result is a 1218681472 x 10
array of 4 byte integers).

Because the number of partitions grows 'explosively' with the number of
items, this is a serious obstacle for statistical partitioning and
clustering methods. For more discouragement, see the 'Bell number'.

You can enumerate these restricted partitions one by one; see

R> ?partitions::nextpart

Matt

On Wed, 2012-01-25 at 15:11 +0000, yan jiao wrote:
> I am using function restrictedparts, but got error:
> 
> 
> restrictedparts(281,10)
> Error in integer(len) : vector size specified is too large
> Calls: restrictedparts -> integer
> In addition: Warning message:
> In restrictedparts(281, 10) : NAs introduced by coercion
> Error in integer(len) : vector size specified is too large
> Calls: restrictedparts -> integer
> 
> 
> is there a similar function can deal with long vector?
> 
> I'm using R version 2.14.1 (2011-12-22),x86_64, linux-gnu
> 
> many thanks
> 
> yan
> 
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