Re: [Boost-users] question about ublas

From: Toon Knapen (toon.knapen_at_[hidden])
Date: 2004-09-03 03:36:15

yanyaqin wrote:

> 1. In ublas::vector, there's 3 constructions:
> 
> |vector ()| 	Allocates an uninitialized |vector| that holds zero elements.
> |vector (size_type size)|	Allocates an uninitialized |vector| that holds 
> |size| elements.
> |vector (const vector &v)|
> 
> but how can i construct a vector with the default value like std::vector( n, value )
> 
>  

You can't AFAICT. What you can do is
ublas::vector< double > v(10) ;
std::fill( v.begin(), v.end(), value ) ;

> 
> 2. How to make ublas more efficiency?
> 
> I tried to comment some mac define of check in ublas/config.hpp, and found it make some sense.
> 
> I wonder if some one has  more experience to share.
> 
>  

Most important is that you define NDEBUG to avoid all assertions.

I suggest to use the ublas-dev mailing list in the future (I will CC:
that list for now)