[R] Same initial seed

[diegol]

Update:

I had tried, immediately after launching the console:

> rm(list=ls())

which did not seem to affect .Random.seed. But now I try:

> rm(.Random.seed)

which seems to force .Random.seed to regenerate from current time.

Can I feel confident to have solved the problem?

Thanks!



diegol wrote:
> 
> Hello,
> 
> I have tried a few searches without luck before posting, since this one
> seems a pretty basic question. 
> I am using R 2.7.0 on WinXP, as I have long started using this version for
> my thesis work and am reluctant to update fearing consistency/backward
> compatibility issues could happen.
> 
> I noticed that whenever I start an R session (launch the console
> application) and run a script involving random number generation, eg:
> 
>> rnorm(10)
> 
> I get the same result. In fact, each time I start a new R session and
> enter
> 
>> .Random.seed
> 
> I get the same exact vector. From ?.Random.seed:
> 
> "Initially, there is no seed; a new one is created from the current time
> when one is required. Hence, different sessions will give different
> simulation results, by default." (as stated in R 2.7.0's documentation)
> 
> When I try RSiteSearch(".Random.seed") I get this updated result:
> 
> "Initially, there is no seed; a new one is created from the current time
> when one is required. Hence, different sessions started at (sufficiently)
> different times will give different simulation results, by default.
> However, the seed might be restored from a previous session if a
> previously saved workspace is restored."
> 
> My PC clock is working fine. I think the problem is not related to
> allotting "sufficient" time between sessions either, which leads me to
> think this has to do with a previously saved workspace, which in the case
> I mention is indeed restored.
> 
> I would like to generate different random numbers in each session. The two
> choices I seem to have are: 
> i) Not restore the workspace so a new seed is created from the current
> time (I have to look into how to go about this); 
> ii) Leave the workspace alone and manually set a new seed via set.seed()
> 
> Am I leaving any options out or getting something wrong?
> 
> Thank you.
> 


-----
~~~~~~~~~~~~~~~~~~~~~~~~~~
Diego Mazzeo
Actuarial Science Student
Facultad de Ciencias Económicas
Universidad de Buenos Aires
Buenos Aires, Argentina
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