The OPAL Discussion Forum

["Frey Matthias (PSI)" <matthias.frey AT psi.ch>]

Dear Bettina,

The SEED in the Sampler is different to the SEED used for the particle distribution, which the manual refers to (I think).

So, if you use SEED=-1 for the particle distribution, OPAL takes the time. If you use the SEED=-1 for the sampler,

it doesn't take the time to generate the samples.

Best,

Matthias

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Von: opal-request AT lists.psi.ch <opal-request AT lists.psi.ch> im Auftrag von Kuske, Bettina <bettina.kuske AT helmholtz-berlin.de>
Gesendet: Mittwoch, 25. März 2020 10:16:17
An: opal AT lists.psi.ch
Betreff: [Opal] Error in option seed

 

Dear developers,

I am using the seed option.

Refering to the manual, SEED=-1 uses the time as seed,

so to my understanding, each run of the same sampler file should

have a different seed and thus different samples.

This doesn't seem to work.

I ran a sampler file twice with SEED=-1 with only one variable.

Each time I start the run, I get identical solenoid settings.

// Sampling methods
SM1: SAMPLING, VARIABLE="sol",  TYPE="UNIFORM",  SEED=-1, RANDOM=TRUE, N=2;

I can work around by setting theseed manually, but that should be fixed, or the manual adapted.

Thank you!

Bettina

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