Re: galaxy collision demo

From: Douglas/Lesli Summerstay <dsummerstay_at_gmail.com>
Date: Mon, 21 Sep 2009 12:35:53 -0400

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
>>>>>>
>>>>>>
>>>>>> -----------------------------------------------------------
>>>>>>
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>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>> -----------------------------------------------------------
>>>>>
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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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>
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-- 
http://dsummerstay.googlepages.com
Received on 2009-09-21 18:36:14

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