Re: galaxy collision demo

From: Jay Billings <jayjaybillings_at_gmail.com>
Date: Mon, 21 Sep 2009 12:30:47 -0400

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
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>>>>> A web-archive of this mailing list is available here:
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>>>>>
>>>>>
>>>>
>>>>
>>>> -----------------------------------------------------------
>>>>
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>>>>
>>>
>>>
>>> --
>>> http://dsummerstay.googlepages.com
>>>
>>>
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>>>
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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 18:30:48

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