Re: Reasonable integration speed? (24 hrs and counting)
- To: mathgroup at smc.vnet.net
- Subject: [mg68036] Re: Reasonable integration speed? (24 hrs and counting)
- From: axlq at spamcop.net (axlq)
- Date: Fri, 21 Jul 2006 05:37:25 -0400 (EDT)
- Organization: "a2i network"
- References: <e9nkvm$9vo$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Update: Going on 48 hours now. I'm concerned that something is
hung, but I fear aborting the job if there's any chance it may
actually be progressing to a solution. I'm unfamiliar with what I
can expect in terms of Mathematica's speed of solving an integral.
Is this reasonable? Is there a setting somewhere that shows some
sort of progress indicator?
-Alex
In article <e9nkvm$9vo$1 at smc.vnet.net>, axlq <axlq at spamcop.net> wrote:
>I downloaded the trial version of Mathematica to see if it could
>solve a complex integral. After getting comfortable with solving
>simple integrals, I input my target problem:
>
>In[1]:= f[x] = Sqrt[a^2+(q-x)^2]
>
>In[2]:= Integrate[Cos[(2*n + 1)*Pi*x/d]*
> (Exp[-I*k*f[x]]/(4*Pi*f[x]^5)*((1 + I*k*f[x])*(2*f[x]^2 - 3*a^2)
> + (k*a*f[x])^2) * I*d/(2*Pi* w) + p), {x, -d/2, d/2}]
>
>Observations:
>
>1. It's been sitting there for over 24 hours now.
>
>2. Task Manager shows Mathematica's CPU usage at a constant 50%.
>
>3. The "Kernel" pull-down menu has "Interrupt Evaluation" grayed out.
> I can abort it.
>
>4. Mathematica won't solve any subsequent problem in another window
> (seems like the first one is occupying a queue).
>
>Earlier I tested some simple function-reference integrals (e.g.
>defining f[x] first and then integrating f[x]dx) and they worked.
>
>What sort of speed can I expect from this? Is 24 hours too long to
>solve a problem like this on a 2.6 GHz Windows XP platform with 1.25
>GB RAM? Is Mathematica hung up on something? Is the fact that I'm
>using the trial version make any difference? Did I do something
>wrong?
>
>Thanks.
>-Alex