[R] Memory errors when using QCA package

[David Winsemius]

But:

 > 2^31-1   # is more than the specified problem length
[1] 2147483647
 >   2130706560

You may be dealing with a system that is not facile at memory  
allocation. Windows?


On Jul 22, 2009, at 9:16 AM, Allan Engelhardt wrote:

> It is a little stupid, but the length of a vector is limited to  
> 2^31-1 entries on any platform.  A matrix is stored as a vector, so  
> the product of all dimensions is also limited to 2^31-1.
>
> Allan.
>
> Matthew Gwynne wrote:
>> Hi,
>>
>> I have been using the QCA package, in particular the "eqmcc" function
>> and I am having some issues when trying to use this to minimise a
>> particular boolean function.
>>
>> The  boolean function in question has 16 variables, and I am  
>> providing
>> the full truth table for the function (65536 with 256 true entries),
>> in the following way :
>>
>> library(QCA)
>>
>> func_tt = read.table("func.tt",header=TRUE)
>> eqmcc(func_tt, outcome="O", expl.0=TRUE)
>>
>> However, after calculating for a little while, the system throws up a
>> memory error :
>>
>> Error in vector("double", length) :
>>  cannot allocate vector of length 2130706560
>>
>>
>> However, looking at the memory usage, I seem to have far more than  
>> 2GB free.
>>
>> Is there some kind of built-in limit on the size of the heap in R? If
>> so, is there some way I can extend this?
>>
>> Does anyone have any insight into this? Perhaps I am doing  
>> something stupid?
>>
>> Thanks
>>
>> Matthew
>>
>> ______________________________________________
>> R-help at r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

David Winsemius, MD
Heritage Laboratories
West Hartford, CT