also you could do this for the 3 variable constructor:

class vector3 : public ublas::vector<double, ublas::bounded_array<double,3> >
{
    typedef ublas::vector<double, ublas::bounded_array<double,3> > Base_vector;
public:
    // Default construction
    vector3 (double x, double y, double z) : Base_vector(3)
    { data()[0] = x; data()[1] = y; data()[2] = z; }
    // Construction and assignment from a uBLAS vector expression or copy assignment
    template <class R> vector3 (const ublas::vector_expression<R>& r) : Base_vector(r)
    {}
    template <class R> void operator=(const ublas::vector_expression<R>& r)
    {
        Base_vector::operator=(r);
    }
    template <class R> void operator=(const Base_vector& r)
    {
        Base_vector::operator=(r);
    }
};

I took this class from the effective ublas wiki and just added the constructor you wanted.

Link to effective ublas wiki: http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl?Effective_UBLAS

On Wed, Aug 20, 2008 at 4:39 PM, Leon Gu <leongu@gmail.com> wrote:

the boost assignment library might be helpful.

an example:

#include <boost/assign/std/vector.hpp>
std::vector<float> v;
v += 13.7,15.8,38.1;
bounded_vector<float, 3> u;
std::copy(v.begin(), v.end(), u.begin());

Leon

Rob McDonald wrote:

I would like to be able to have a bounded_vector<double, 3> which I can instantiate something like this...

typedef bounded_vector<double, 3> vect;
vect v = vect(0.0, 1.23, 3.45);

This requires a new constructor of the form

bounded_vector(T x, T y, T z);

Since constructors and the equals operator aren't inherited, I can't just implement this one constructor. And, while I'm at it, I may as well keep the code generic to type, but specific to 3 elements...

So, I've copied the code for a bounded_vector from vector.hpp. So far, all I've really done is change the template parameter N to a 3. At this point, I can't figure out how to implement my desired constructor...

I need to either 1) access the data directly or 2) use the available interface.

I poked around in the source such that 'data () [i] =' looked like it might be promising, but that doesn't seem to work. No combinations of 'this(i) =' or what not have worked either.

For 1), I haven't been able to figure out for sure where the data is really stored and if I have access permissions to it.

For 2), I haven't been able to figure out how to access the overloaded () operator in the constructor.

Here is one of many failed attempts:

BOOST_UBLAS_INLINE
bounded_vector3 (T x, T y, T z):vector_type(3){
data () [0] = x;
data () [1] = y;
data () [2] = z;
}

After I get that working, I have another similar challenge...

I would like to be able to assign one of these vectors with a comma delimited list. This is currently done in Blitz++, and I am migrating some code from Blitz to boost::ublas.

So, I want to be able to do this....

vect v;
v = (1.2), (3.5), (7.8); // I'm not sure if the () are significant.

Any help will be greatly appreciated,

Rob

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