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Re: Avoiding a FOR loop in calculation of SPH potential energy [message #67092 is a reply to message #67086]

Tue, 23 June 2009 00:29

cody
Messages: 4
Registered: December 2002

Junior Member

i've been reading through this discussion group and one thing i see
often is that you can vectorize a FOR loop to avoid it. so my code
would be something like:

u = 1 + bytarr(pn)
dx = u#s.x
dy = u#s.y
dz = u#s.z
for i = 0L, pn-1 do dx[0, i] = dx[*, i] - s.x
for i = 0L, pn-1 do dy[0, i] = dy[*, i] - s.y
for i = 0L, pn-1 do dz[0, i] = dz[*, i] - s.z
d = sqrt(dx^2+dy^2+dz^2)
print,'calculated all ds?'

but i'm not able to allocate that much memory for 100k particles and i
wouldn't know how to do the proper potential energy calculation that
way either since not all particles are the same mass.

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[Message index]

		Re: Avoiding a FOR loop in calculation of SPH potential energy By: Jeremy Bailin on Tue, 23 June 2009 21:20
		Re: Avoiding a FOR loop in calculation of SPH potential energy By: Michael Galloy on Tue, 23 June 2009 15:16
		Re: Avoiding a FOR loop in calculation of SPH potential energy By: cody on Tue, 23 June 2009 12:39
		Re: Avoiding a FOR loop in calculation of SPH potential energy By: Chris[6] on Tue, 23 June 2009 07:21
		Re: Avoiding a FOR loop in calculation of SPH potential energy By: cody on Tue, 23 June 2009 00:29

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