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Re: re Optimisation / Sparse Matrices (plain text)
Thank You for your help. I downloaded the current Open Math standard and I
am in the process of studying it. I have an important concern: Are these
standards going to be appropriate for communicating huge objects
(matrices, etc...)? As I read this material, I realize that my
applications requirements are a little different, and I am trying to
decide if MathML/Openmath is the way to proceed with my research.
Also, are there any optimization people involved in these discussions? I
would really appreciate if one of you could get in touch.
Thanks,
Leo.
On Mon, 10 Apr 2000, Stan Devitt wrote:
> Apologies, I meant to send this as plain text.
>
>
>
> There is provision for extensions that handle such things.
> It is through the csymbol element. For example, a
> sparse matrix representation could be defined so that
> For example, you could write:
>
> <apply><csymbol definitionURL=".../SparseMatrix">SparseMatrix</csymbol>
> <vector><cn>5</cn><cn>5</cn><cn>
> <vector><cn>1</cn><cn>1</cn><cn> 3.232432423</cn></vector>
> <vector><cn>1</cn><cn>2</cn><cn> 3.01</cn></vector>
> <vector><cn>1</cn><cn>5</cn><cn> 3.43543453</cn></vector>
> </apply>
>
> to mean a 5 by 5 sparse matrix with the a[i,j] specified for selected
> coordinates. Column defined matrices could be handled in a similar
> manner.
>
> The presentation is handled via XSLT and can range from something
> as simple as listing the non-zero table entries, c/w coordinates, through
> to generating an actual matrix.
>
> What is needed is an agreed apon vocabulary and then
> references to those definitions. Building such a vocabulary
> is one of the goals of the OpenMath project. The MathML content
> definitions match (or will shortly) a specific collection of those
> definitions. Both groups are tracking changes closely.
>
> Stan Devitt
>
>
>
========================================================================
Leonardo B. Lopes leo@iems.nwu.edu
Ph.D. Student (847)491-8470
IEMS - Northwestern University http://www.iems.nwu.edu/~leo
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