[Numpy-discussion] use of %extend

Michel Dupront michel.dupront@hotmail...
Thu Apr 15 04:53:44 CDT 2010


Hello,

 

With the following example, given in the documentation:


struct Vector {
   double x,y,z;
};
%extend Vector {
    Vector __add__(Vector *other) {
         Vector v;
         v.x = $self->x + other->x;
         v.y = $self->y + other->y;
         v.z = $self->z + other->z;
         return v;
    }
};


one can do in python:

>>> import example
>>> v = example.Vector(2,3,4)
>>> w = example.Vector(10,11,12)
>>> print v+w
Vector(12,14,16)
>>> 


There is something more that I would like to do but I don't 
know how. I would like to be able to do:

>>>> v1 = v + 2
>>>> v2 = 2 + v

where v is a vector and 2 a number that would be added to each component
of the vector. 
I would really appreciate any help on that. 
Many thanks in advance.

 
 		 	   		  
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