Re: galaxy collision demo

From: Jay Billings <jayjaybillings_at_gmail.com>
Date: Mon, 21 Sep 2009 12:43:12 -0400

No problem. 1000 it is.

Jay

On Mon, Sep 21, 2009 at 12:35 PM, Douglas/Lesli Summerstay <
dsummerstay_at_gmail.com> wrote:

> 1000 would be best, but whatever you can do. Thanks so much for your help!
> Douglas
>
>
> On Mon, Sep 21, 2009 at 12:30 PM, Jay Billings <jayjaybillings_at_gmail.com>wrote:
>
>> Okay, no problem! I'll try to get something put together for you. How many
>> snapshots would you like? 10, 100, 1000?
>>
>> I can also direct you to some source for reading and writing the files or
>> point you to recent discussions on the list.
>>
>> Jay
>>
>>
>> On Mon, Sep 21, 2009 at 12:25 PM, Douglas/Lesli Summerstay <
>> dsummerstay_at_gmail.com> wrote:
>>
>>> We are developing a method for automatically selecting key-frames in data
>>> that contain the most information about how the evolution of particle data
>>> is happening, that best describe the animation (I am at the University of
>>> Maryland, working with Amitabh Varshney). To do this, I need scientifically
>>> interesting particle data in four dimensions. We thought this data would be
>>> just what we needed (especially since there are already "keyframes" evenly
>>> spaced in time that others have published on the web to compare it to), but
>>> so far I haven't been successful in generating it. I can write a
>>> program in C++ or Matlab to read the snapshot files, since they're described
>>> pretty well in the documentation.
>>> I would be very grateful if you could find a way to send me those
>>> snapshots.
>>>
>>> Douglas
>>>
>>>
>>> On Mon, Sep 21, 2009 at 11:26 AM, Jay Billings <jayjaybillings_at_gmail.com
>>> > wrote:
>>>
>>>> Douglas,
>>>>
>>>> I had compiled FFTW wrong in my case, but I don't know if this is the
>>>> problem with yours. You could probably track your problem down quickly with
>>>> a debugger or some print statements.
>>>>
>>>> I could supply you with some snapshots, but I have to ask why need it?
>>>> Also, do you have the capability to read to read the snapshots? I don't mean
>>>> for the first question to sound offensive; I just need to be sure that you
>>>> don't need it for a homework problem or something.
>>>>
>>>> Jay
>>>>
>>>>
>>>> On Mon, Sep 21, 2009 at 11:06 AM, Douglas/Lesli Summerstay <
>>>> dsummerstay_at_gmail.com> wrote:
>>>>
>>>>> Jay,
>>>>> I imagine it may be, as you say, some kind of compilation error on my
>>>>> part. It is running, using up CPU, but not generating even the first
>>>>> snapshot in galaxy/ . Any idea the nature of the error you had? Or
>>>>> suggestions on how to track it down? Unfortunately I need the 3D
>>>>> position data, not just the video.
>>>>> Thanks again.
>>>>>
>>>>> Douglas
>>>>>
>>>>>
>>>>> On Mon, Sep 21, 2009 at 10:51 AM, Jay Billings <
>>>>> jayjaybillings_at_gmail.com> wrote:
>>>>>
>>>>>> Douglas,
>>>>>>
>>>>>> You are correct that you should see a snapshot at t=0 for the test
>>>>>> problem. Did you look in the galaxy/ directory? The snapshots are stored
>>>>>> there.
>>>>>>
>>>>>> The test problem with default settings only outputs six or seven
>>>>>> snapshot files from t=0 to t=3.0. I'm a bit concerned that it has taken
>>>>>> "days" without creating any snapshot files; that test problem runs in 15
>>>>>> minutes on my quad core machine and in about an hour on my old P4. When I
>>>>>> first started working with Gadget2 I encountered a similar problem to yours
>>>>>> and it turned out to be a compile error.
>>>>>>
>>>>>> If you are only interested in videos, you might check out my youtube
>>>>>> page: http://www.youtube.com/jayjaybillings . These are videos of a
>>>>>> different simulation.
>>>>>>
>>>>>> Jay
>>>>>>
>>>>>> On Mon, Sep 21, 2009 at 10:39 AM, Douglas/Lesli Summerstay <
>>>>>> dsummerstay_at_gmail.com> wrote:
>>>>>>
>>>>>>> I am trying to run the galaxy collision sample and had a few
>>>>>>> questions:I am trying to run it on a single processor. How long
>>>>>>> should I expect to wait before seeing any output snapshot files? (I am using
>>>>>>> the default parameter file.) I left it running for days without seeing any
>>>>>>> snapshot files created. This seems odd because the first snapshot is
>>>>>>> supposed to be created at time 0. Any idea why no snapshot files are being
>>>>>>> created? Alternately, could anyone run this simulation and make the snapshot
>>>>>>> files available to me?
>>>>>>> Are the pictures of colliding galaxies on the Gadget site (
>>>>>>> http://www.mpa-garching.mpg.de/gadget/collision/index.html ) from
>>>>>>> this simulation?
>>>>>>>
>>>>>>> Thanks for your help.
>>>>>>>
>>>>>>> --
>>>>>>> http://dsummerstay.googlepages.com
>>>>>>>
>>>>>>>
>>>>>>> -----------------------------------------------------------
>>>>>>>
>>>>>>> If you wish to unsubscribe from this mailing, send mail to
>>>>>>> minimalist_at_MPA-Garching.MPG.de with a subject of: unsubscribe
>>>>>>> gadget-list
>>>>>>> A web-archive of this mailing list is available here:
>>>>>>> http://www.mpa-garching.mpg.de/gadget/gadget-list
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>> -----------------------------------------------------------
>>>>>>
>>>>>> If you wish to unsubscribe from this mailing, send mail to
>>>>>> minimalist_at_MPA-Garching.MPG.de with a subject of: unsubscribe
>>>>>> gadget-list
>>>>>> A web-archive of this mailing list is available here:
>>>>>> http://www.mpa-garching.mpg.de/gadget/gadget-list
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> http://dsummerstay.googlepages.com
>>>>>
>>>>>
>>>>> -----------------------------------------------------------
>>>>>
>>>>> If you wish to unsubscribe from this mailing, send mail to
>>>>> minimalist_at_MPA-Garching.MPG.de with a subject of: unsubscribe
>>>>> gadget-list
>>>>> A web-archive of this mailing list is available here:
>>>>> http://www.mpa-garching.mpg.de/gadget/gadget-list
>>>>>
>>>>>
>>>>
>>>>
>>>> -----------------------------------------------------------
>>>>
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>>>>
>>>>
>>>
>>>
>>> --
>>> http://dsummerstay.googlepages.com
>>>
>>>
>>> -----------------------------------------------------------
>>>
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>>>
>>>
>>
>>
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>>
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>>
>
>
> --
> http://dsummerstay.googlepages.com
>
>
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>
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Received on 2009-09-21 18:43:12

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