[Dune-devel] Reg: The project on IMPLEMENTING INSERTERS FOR DUNE SPARSE MATRICES

[Markus Blatt]

Hi Abhineet,

I have to admit that I am not really sure whether I understand your
email. Nevertheless I will try to answer as best as I can.

On Fri, Apr 12, 2013 at 04:28:24AM +0530, abhineet agarwal wrote:
> [...] I had been thinking about  what are the set of operations
> that will be applied for the sparse matrix which is to be build using
> inserters

The inserter is supposed to setup the sparsity pattern of the matrix
while allowing to write the nonzeros entries already at this time.
(Normally this is a two step procedure)

> as any data structure is selected for performing the required set
> of operations faster than any other data structure. 

The user selects the data struture (e.g. FieldMatrix, BCRSMatrix,
DiagonalMatrix) and then constructs an inserter for it.

> Is this sparse matrix
> being used for storing linear equation or some other set of equations which
> has as a whole large set of variables but per equation only limited number
> of variables and is the operation only insertion which this project is
> focusing on and the rest to be modified after developement of this module.

Yes a sparse matrix is used for storing a system of (N) linear equations,
where each variable is only influenced by roughly (n<<N) other
variables.

Regards,

Markus

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