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Re: Astronomys` Sixth Neighbour Needs Help [message #35953 is a reply to message #35884]

Mon, 28 July 2003 05:40

Ben Panter
Messages: 102
Registered: July 2003

Senior Member

Bruno,

> I talked to the administrator here about that nice value and
> understand it now. Thanks Benjamin, it sounds like a good
> alternative. So you are also dealing with the beauties of astronomy
> programming?! They never told me I would have to program this much to
> do some science.

<heavy sigh>

Yeup.

I use IDL to drive something called "MOPED" - basically a very good
compression algorithm. It allows you to work out model parameters very
quickly - we get star formation history information out of sloan galaxy
spectra. In my case, each spectra takes about 3mins - which is great
compared to the brute force approach which is more like 10+ hours. 3
minutes sounds pretty short - but then I do have 135 000 galaxies to
look at (so far!). If you're very bored one day, check out astro-ph and
look for "Panter"

On the plus side though - all this computing means that you

a) Don't have to get cold at telescopes
b) Don't have to reduce your own data
c) Don't have to use blink tables
d) Have unlimited access to Google

I think we get a better deal...

> I am also writing because in an attempt to test the program with the
> changes suggested by Pavel, I tried a 15000 star field and IDL spat
> out, after an hour and a half of processing (so it must have just
> finished the calculation of the distances and the sorting of these),
> that it could not allocate the memory necessary to make the array...
> have I now achieved the limits of the program for this computer or is
> there some way of going around this problem?

You've heard of GIYF? I think here it might be JDSIYF!

Ben

--
Ben Panter, Edinburgh
My name (no spaces)@bigfoot which is a com.

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[Message index]

		Astronomys` Sixth Neighbour Needs Help By: touser2001 on Thu, 24 July 2003 13:40
		Re: Astronomys` Sixth Neighbour Needs Help By: touser2001 on Tue, 29 July 2003 15:21
		Re: Astronomys` Sixth Neighbour Needs Help By: David Fanning on Tue, 29 July 2003 10:16
		Re: Astronomys` Sixth Neighbour Needs Help By: Pavel Romashkin on Tue, 29 July 2003 08:40
		Re: Astronomys` Sixth Neighbour Needs Help By: jjbezair on Tue, 29 July 2003 06:34
		Re: Astronomys` Sixth Neighbour Needs Help By: David Fanning on Mon, 28 July 2003 15:27
		Re: Astronomys` Sixth Neighbour Needs Help By: touser2001 on Mon, 28 July 2003 14:53
		Re: Astronomys` Sixth Neighbour Needs Help By: touser2001 on Mon, 28 July 2003 14:40
		Re: Astronomys` Sixth Neighbour Needs Help By: pford on Mon, 28 July 2003 11:30
		Re: Astronomys` Sixth Neighbour Needs Help By: David Fanning on Mon, 28 July 2003 08:32
		Re: Astronomys` Sixth Neighbour Needs Help By: David Fanning on Mon, 28 July 2003 06:45
		Re: Astronomys` Sixth Neighbour Needs Help By: Ben Panter on Mon, 28 July 2003 05:40
		Re: Astronomys` Sixth Neighbour Needs Help By: JD Smith on Sun, 27 July 2003 23:22
		Re: Astronomys` Sixth Neighbour Needs Help By: touser2001 on Sat, 26 July 2003 13:48
		Re: Astronomys` Sixth Neighbour Needs Help By: Ben Panter on Sat, 26 July 2003 00:48
		Re: Astronomys` Sixth Neighbour Needs Help By: touser2001 on Fri, 25 July 2003 19:14
		Re: Astronomys` Sixth Neighbour Needs Help By: Pavel Romashkin on Fri, 25 July 2003 15:34
		Re: Astronomys` Sixth Neighbour Needs Help By: wmconnolley on Mon, 11 August 2003 08:28
		Re: Astronomys` Sixth Neighbour Needs Help By: google_forums on Mon, 11 August 2003 14:20
		Re: Astronomys` Sixth Neighbour Needs Help By: google_forums on Mon, 11 August 2003 07:53
		Re: Astronomys` Sixth Neighbour Needs Help By: wmconnolley on Tue, 12 August 2003 09:57
		Re: Astronomys` Sixth Neighbour Needs Help By: google_forums on Tue, 12 August 2003 09:11
		Re: Astronomys` Sixth Neighbour Needs Help By: wmconnolley on Tue, 12 August 2003 01:40

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