iseed in run_card.dat

Dear Liang,

> I set “1 = iseed” in run_card.dat, but it became “0 = iseed” after I run “./bin/generate_events -f”,

I like this behaviour quite a lot, but I do not reproduce it.

> I want to know which of “1 = iseed” or “0 = iseed” I used?
To be sure, you can look at the banner which should indicate the correct value that you are using.

> Additionally, if I run “./bin/generate_events -f” 20 times with “0 = iseed”, the produced events are independent statically

Yes

> I want to know if it is equivalent to setting “1 = iseed”, “2 = iseed”, …, “20 = iseed” when every run “./bin/generate_events”.

it is equivalent, but the value choose are not 1/2/3/…. you can look at the banner to see the actual value used.
Note that you can also use the “multi_run” function (from the ./bin/madevent interface) to run 20 run in a row.

> What is more, I want to know how to understand the sentence “0=assigned automatically=default” in run_card.dat?

We basically use the latest seed use in that local directory increment it by the number of process of your run and that will be the next seed.

Cheers,

Olivier

On 08 Apr 2015, at 05:51, liangshang <email address hidden> wrote:

> New question #264773 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/264773
>
> Dear,
> I set “1 = iseed” in run_card.dat, but it became “0 = iseed” after I run “./bin/generate_events -f”, I want to know which of “1 = iseed” or “0 = iseed” I used?
> Additionally, if I run “./bin/generate_events -f” 20 times with “0 = iseed”, the produced events are independent statically. I want to know if it is equivalent to setting “1 = iseed”, “2 = iseed”, …, “20 = iseed” when every run “./bin/generate_events”.
> What is more, I want to know how to understand the sentence “0=assigned automatically=default” in run_card.dat?
>
> Best Regards,
> Liang
>
>
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