Re: [Boost-users] Multi Index: Nested std::pair

Subject: Re: [Boost-users] Multi Index: Nested std::pair
From: Etienne Philip Pretorius (icewolfhunter_at_[hidden])
Date: 2009-04-27 04:32:58

> Hi Etienne,
> 
> Could you please elaborate on what is meant by "unique values"? This is 
> not clear to
> me from the explanations on your previous posts. It might help to state 
> your requirements
> in the reverse way: what kind of duplications involving value should be 
> banned from the
> container? For instance, the ordered_unique index you show us above bans 
> duplicate
> elements having the same form (x,*,value), where * indicates that the y 
> member is
> immaterial here.
> 
Hello Joaquín,

I am doing a matrix operation where I need to know the number of unique 
values per x co-ordinate and number of unique values per y co-ordinate.

N-th row, x=N, but how many unique "values" are there in this row?
N-th column, y=N, but how many unique "values" are there in the column?

> Joaquín M López Muñoz
> Telefónica, Investigación y Desarrollo
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