representing matrix as two dimensional array in Slang

I want to create a plugin on Gaussian elimination on matrix. The examples of gaussian elimination in C code are mostly taking in the matrix as two dimensional array. How can I write it in Slang? How to represent 2 dimensional float matrix in Slang? Are there any examples in Slang?

Thanks for help.
Ang Beepeng

2008/9/29 Ang Beepeng <[hidden email]>:
>
> I want to create a plugin on Gaussian elimination on matrix. The examples of
> gaussian elimination in C code are mostly taking in the matrix as two
> dimensional array. How can I write it in Slang? How to represent 2
> dimensional float matrix in Slang? Are there any examples in Slang?
>
Hardware does not supports 2 dimensional arrays :)
Therefore, when you write something like:
z := array [x,y]  , compiler decomposing this code to following:

z:= singleDimentionArrayPointer[x*numCols + y]

in same way, in slang you can use a linear buffer of floats, and write
access routine which taking two indexes, but then translating them to
single index in your buffer, and voila - you have a two-dimentional
matrices :)



> Thanks for help.
> Ang Beepeng
> --
> View this message in context: http://www.nabble.com/representing-matrix-as-two-dimensional-array-in-Slang-tp19728457p19728457.html
> Sent from the Squeak - Dev mailing list archive at Nabble.com.
>

--
Best regards,
Igor Stasenko AKA sig.

I fixed the bug, it was not in Kronecker multiplication but in Schur's Complement method, which I had originally used for
the LU Decomposition but later implemented a faster algorithm (from Cormen's MIT book on algorithms).
The code works now (version 27), but it needs cleaning.
It also needs faster normal multiplication algorithm, cholesky decomp,, eigenvalue finding and a few other basic things.
I released the code as MIT, and it is accesible through squeaksource now that it is up again.
Cheers


r.

"Joseph T. Bore" <[hidden email]> 30/09/2008 20:55

To Ramiro Diaz Trepat <[hidden email]> cc Subject Re: [squeak-dev] representing matrix as two dimensional array in Slang

oh ok, thanks.

jb

On Tue, 30 Sep 2008,
Ramiro Diaz Trepat wrote:

> Sorry !
> I meant squeaksource.com
> Just look up Numerics in the projects section.
> I still have to fix the kronecker multiplication, should be done soon.
> Cheers
>
>
> r.
>
>
> On Tue, Sep 30, 2008 at 3:46 AM, Joseph T. Bore <[hidden email]> wrote:
>
>>
>> maybe im blind, but i just looked on squeak map and i dont see that, i also
>> looked on map.squeak.org via the browser and i also dont see it there.
>> can you send a link to the exact location?
>> jb
>>
>>
>>
>> On Sep 29, 2008, at 5:38 PM, Ramiro Diaz Trepat wrote:
>>
>> I have created a package called Numerics in squeakmap that adds has a
>> Vector and Matrix  class that can solve LU decompositions, linear equations,
>> determinants, normal multiplication, kronecker multiplication and a few
>> other things.
>> It has test cases with examples.
>> It is quite green still but test cases pass.  Although right now I am
>> refactoring a few things and I broke the kronecker multiplication, but I
>> should fix it soon.
>> I wanted to add Cholesky decomposition and eigenvalue finding to it, if you
>> want to join in, you are more than welcome.
>> Cheers
>>
>> r
>>
>>
>> On Mon, Sep 29, 2008 at 6:43 PM, Ang Beepeng <[hidden email]> wrote:
>>
>>>
>>> I want to create a plugin on Gaussian elimination on matrix. The examples
>>> of
>>> gaussian elimination in C code are mostly taking in the matrix as two
>>> dimensional array. How can I write it in Slang? How to represent 2
>>> dimensional float matrix in Slang? Are there any examples in Slang?
>>>
>>> Thanks for help.
>>> Ang Beepeng
>>> --
>>> View this message in context:
>>> http://www.nabble.com/representing-matrix-as-two-dimensional-array-in-Slang-tp19728457p19728457.html
>>> Sent from the Squeak - Dev mailing list archive at Nabble.com.
>>>
>>>
>>>
>>
>>
>>
>

--
[hidden email]

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