Re: [igraph] Random number generator(RNG) question

[Gabor Csardi]

Richard,

if you use igraph from C or Python then the standard C library rand()
is used with a seed based on the current time as returned by time(). 
(I agree that this might be a poor solution.)

If you use GNU R with the igraph package then R's random rumber 
gerenerator is used. See ?RNGkind in R. (This is another reason
to use igraph from R instead of programming in C.)

Having a more flexible RNG interface has been on the TODO list
for a while....

Gabor

On Tue, Dec 04, 2007 at 03:45:53PM -0500, Richard Geddes wrote:
> Hello,
> 
> I'm interested in using the random network generating functions in the
> igraph library.  I assume a RNG is used in these functions.  My studies
> tell me that not all RNG's are the same.. some more random than others. 
> I was wondering if someone could either give a summary of the igraph RNG
> or point me to some info that describes the methodologies used in the
> igraph RNG. 
> 
> Also can the igraph RNG generate 64-bit random numbers for 64-bit
> environments?
> 
> Thank you
> Richard
> 
> 
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-- 
Csardi Gabor <address@hidden>    MTA RMKI, ELTE TTK