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## 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
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