[Gate-users] manually set random seed

[Daniel Woodsworth]

Hi,

Maxime- thanks for your reply. I have a remaining question. Will what you
suggested set the seed of the random generator once, at the beginning of a
simulation? Or will it set the seed at the beginning of each run (ie. time
slice/projection)?

Suppose I am simulating a SPECT scan of 128 projections. Suppose I have a
file seed.rndm containing the number 17. Will /random/resetEngineFrom
seed.rndm start the random number generator from 17, once, at the
beginning of the simulation, and then carry on as in a normal simulation
(ie. no seed specified): taking the seed of the random number generator
from the last run? Or will each projection start with a random sequence
seeded at 17, thus giving me (assuming rotational symmetry, and time
invariance) 128 identical projections? What I am hoping for is a way to
achieve the former.

What I am trying to do is run multiple simulations (with identical
geometry, activity, physics, digitizer etc.) and just manually change the
random number sequence of the overall simulation, in order to get
different results for the same physical set up.

Thanks for any help.

Daniel

> Hi Daniel,
>
> To set the seed of the random generator, you have to create a new text
file in your job directory, for example seed.rndm, in which you write
the seed of your choice.
>
> After, you have also to write the following line in your macro:
> /random/resetEngineFrom seed.rndm
>
> I hope it will help you.
>
> Maxime
>
>
> Quoting Daniel Woodsworth <danieljw at phas.ubc.ca>:
>
>> Hi,
>> Is it possible to manually set the seed of the random number generator in
>> GATE?
>> Ie. is there some command
>> /gate/some_word/setRandomSeed 55
>> Thanks for any help.
>> Daniel Woodsworth
>> _______________________________________________
>> Gate-users mailing list
>> Gate-users at lists.healthgrid.org
>> http://lists.healthgrid.org/mailman/listinfo/gate-users
>
>
>
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