[R] Problem with random numbers/seed
Steven Yen
@tyen @end|ng |rom ntu@edu@tw
Fri Jun 21 19:09:28 CEST 2019
Now I see that results were replicated but running RNGversion
I get a warning message. Isn't there a way to do this clean?
> RNGversion("3.5.3") Warning message: In RNGkind("Mersenne-Twister",
"Inversion", "Rounding") : non-uniform 'Rounding' sampler used
On 6/22/2019 1:03 AM, Uwe Ligges wrote:
> What does not work?
>
>
> For me it works under R-3.6.0:
>
> x<-1:500
> set.seed(12345671)
> j<-sample(1:length(x),size=60); y<-x[j]
> summary(j)
>
> RNGversion("3.5.3")
> set.seed(12345671)
> j<-sample(1:length(x),size=60); y<-x[j]
> summary(j)
>
>
> Now I get the results you got udner the old R.
>
> Best,
> Uwe Ligges
>
>
>
> On 21.06.2019 18:39, Steven Yen wrote:
>> Thanks. Somewhat of a mystery. The older version I had was
>> R-3.5.3patched.
>> I cannot get the RNGversion command to run. Can you help? Thanks.
>>
>> On 6/22/2019 12:25 AM, Uwe Ligges wrote:
>>> See the NEWS, the RNG has been changed, use RNGversion
>>>
>>> On 21.06.2019 18:10, Steven Yen wrote:
>>>> Dear all,
>>>> I did all this work with older R (R-3.5.3.patched and older)
>>>> but now with R3.6 I cannot replicate the results.
>>>> Below I sample 60 observations from 1:500 using the sample command
>>>> with
>>>> a random seed of 123. I get different results. Advice appreciated.
>>>> Steven Yen
>>>>
>>>> > # Run under R-3.6.0
>>>> > x<-1:500
>>>> > set.seed(12345671)
>>>> > j<-sample(1:length(x),size=60); y<-x[j]
>>>> > summary(y)
>>>> Min. 1st Qu. Median Mean 3rd Qu. Max.
>>>> 26.0 134.2 240.0 249.8 368.0 500.0
>>>>
>>>> > # Run under R-3.5.3.patched
>>>> > x<-1:500
>>>> > set.seed(12345671)
>>>> > j<-sample(1:length(x),size=60); y<-x[j]
>>>> > summary(y)
>>>> Min. 1st Qu. Median Mean 3rd Qu. Max.
>>>> 9.0 122.2 205.0 236.1 364.2 493.0
>>>>
>>>
>>>
>>> Under R-3.6.0 use, e.g.
>>> RNGversion("3.5.2")
>>> to get reproducible results from the older RNG.
>>>
>>> Best,
>>> Uwe Ligges
>>>
>>>
>>
>> --
>> styen using ntu.edu.tw (S.T. Yen)
>>
>
--
styen using ntu.edu.tw (S.T. Yen)
[[alternative HTML version deleted]]
More information about the R-help
mailing list