dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Sat, Jun 21, 2008 at 05:29:14AM -0400, Hatef Monajemi wrote:
> 
> Hi
> Isn't this code supposed to work? It gives me "invalid lvalue in 
> assignment" error while compiling. How should I assign the elements of 
> a Matrix???
> 
> //-------------------------------
> int main()
> {
> 
> 
> for(i=0; i<nens; i++)
> .
> .
> .
> real* values = new real[nstat];
> u1.interpolate(values);
> 
> Matrix S(nstat,nens);
> 
> for(int j=0;j<nstat;j++)
>   {
>     S(j,i)=values[j];
>   }
>  
> }

Sorry, this doesn't work yet.

We can easily fix this in the GenericMatrix interface by adding an
auxiliary class MatrixEntry (which just holds (i, j) and a reference
to the matrix) and have operator() return that, then overload
operator= in MatrixEntry to assign to the matrix.

We had this in DOLFIN 2-3 years back but the linear algebra has gone
through several reimplementations since then...

Until this has been implemented, you can use the setitem() function.

And please file a bug report for this. Mark it as "enhancement".

-- 
Anders

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