Re: [ublas] coordinate_vector help

From: Nico Galoppo (nico_at_[hidden])
Date: 2006-08-16 09:47:15

Thanks for your clarification, Georg. I'm sorry about the non-compilable code. I 
understand I am pretty much force to use coordinate_vector<> as I don't know the 
vector size at compile time, and compressed_vector<> doesn not have preserving 
resize implemented.

I agree that the naming is unfortunate. It is exactly the source of my confusion.

Cheers,

--nico

Georg Baum wrote:

> 
> That is simple: size is the mathematical size of the vector. non_zeros is 
> the number of elements that can actually be stored (structural 
> non-zeroes). All other elements are implicitly zero.
> Therefore you can't insert an element at position 300 if the vector is of 
> mathematical size 10. You need at least
> 
>  	cv_type v(301);
> 
> It works too with append_element if you give the vector an initial size. 
> IMO the name append_element is suboptimal: It suggests that it enlarges 
> the mathematical size of the vector, but that is not the case.
> 
> I also get a suspicious warning when compiling this code (using boost cvs) 
> with gcc 4.1:
> 

-- 
nico galoppo von borries     |  address: 119 fidelity st., carrboro
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