[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: duplicate values in 3D space
From: |
Iago Mosqueira |
Subject: |
Re: duplicate values in 3D space |
Date: |
Fri, 14 Feb 2003 16:10:33 -0000 |
From: "PAUL KIENZLE" <address@hidden>
Sent: 13 February 2003 19:11
Subject: Re: duplicate values in 3D space
> shouldn't that be
> sparse(x-min(x)+1,y-min(y)+1,..., 'sum') ./
> sparse(x-min(x)+1,y-min(y)+1,...,'sum')
Umm, the other version works too.
> Won't it break if your coordinates are negative, zero or non-integer?
Yes, nut I am working on nautical miles, aways positive from a 0,0 point.
> You could do something like:
>
> coords = (x-min(x))*(max(y)-min(y))*(max(z)-min(z)) \
> + (y-min(y))*(max(z)-min(z)) + z-min(z) + 1;
Yes, I thought about it, but when doing the sparse I run out of memory,
since coords goes to 2.8412e+04, quite a big matrix. My cube has 1.381e+08
positions.
> Unavailable. Talk to John before starting work on it
> though since he may have some opinions about how to
> do it.
I am afraid I wouldn't be qualified to do it, just qurious, since my work
involves a lot of 3D matrices.
Cheers,
iago
-------------------------------------------------------------
Octave is freely available under the terms of the GNU GPL.
Octave's home on the web: http://www.octave.org
How to fund new projects: http://www.octave.org/funding.html
Subscription information: http://www.octave.org/archive.html
-------------------------------------------------------------