I respond myself:
Enrico Sirola ha scritto:
[...]
seems to work). The problem for the code above is that it doesn't work
for vectors longer than 1000 elements or so (try it with 2000 and it
doesn't work). I guess I should manage the "toasting" machinery in some
ways - any suggestion is appre
Hi Webb,
Webb Sprague ha scritto:
I'm quite proud, this is my first C extension function ;-)
I'd gladly post the code if it's ok for the list users. It's more or
less 100 lines of code. This approach seems promising...
I would definitely like to see it.
here it goes:
---
> I'm quite proud, this is my first C extension function ;-)
> I'd gladly post the code if it's ok for the list users. It's more or
> less 100 lines of code. This approach seems promising...
I would definitely like to see it.
> By the way, Webb: I took a look at GSL and it seems to me that, from
Hi Webb, Joe, Martijn
Webb Sprague ha scritto:
On Feb 1, 2008 2:31 AM, Enrico Sirola <[EMAIL PROTECTED]> wrote:
Hello,
I'd like to perform linear algebra operations on float4/8 arrays
Having avoided a bunch of real work wondering about linear algebra and
PG, did you consider the Gnu Scientifi
Ted Byers wrote:
> --- Webb Sprague <[EMAIL PROTECTED]> wrote:
>>> ...linear algebra ...
>> ... matrices and vectors .
> ...Especially if some GIST or similar index
>> could efficiently search
> for vectors "close" to other vectors...
>
> I see a potential problem here, in terms of
On Feb 1, 2008 2:31 AM, Enrico Sirola <[EMAIL PROTECTED]> wrote:
> Hello,
> I'd like to perform linear algebra operations on float4/8 arrays
Having avoided a bunch of real work wondering about linear algebra and
PG, did you consider the Gnu Scientific Library ? We would still need
to hook everyth
--- Webb Sprague <[EMAIL PROTECTED]> wrote:
> > ...linear algebra ...
> > >>> ... matrices and vectors .
> > >> ...Especially if some GIST or similar index
> could efficiently search
> > >> for vectors "close" to other vectors...
> > >
I see a potential problem here, in terms of how one
define
> ...linear algebra ...
> >>> ... matrices and vectors .
> >> ...Especially if some GIST or similar index could efficiently search
> >> for vectors "close" to other vectors...
> >
> > Hmm. If I get some more interest on this list (I need just one LAPACK
> > / BLAS hacker...), I will apply for
Webb Sprague wrote:
> On Feb 1, 2008 12:19 PM, Ron Mayer <[EMAIL PROTECTED]> wrote:
>> Webb Sprague wrote:
>>> On Feb 1, 2008 2:31 AM, Enrico Sirola <[EMAIL PROTECTED]> wrote:
...linear algebra ...
>>> ... matrices and vectors .
>> ...Especially if some GIST or similar index could efficiently
Hi Joe,
I don't know if the speed will meet your needs, but you might test
to see if PL/R will work for you:
http://www.joeconway.com/plr/
You could use pg.spi.exec() from within the R procedure to grab the
arrays, do all of your processing inside R (which uses whatever BLAS
you've set
Enrico Sirola wrote:
typically, arrays contain 1000 elements, and an operation is either
multiply it by a scalar or multiply it element-by-element with another
array. The time to rescale 1000 arrays, multiply it for another array
and at the end sum all the 1000 resulting arrays should be enough
(I had meant also to add that a linear algebra package would help
Postgres to be the mediator for real-time data, from things like
temprature sensors, etc, and their relationship to not-so-scientific
data, say in a manufacturing environment).
On Feb 1, 2008 12:19 PM, Ron Mayer <[EMAIL PROTECTED]
Webb Sprague wrote:
> On Feb 1, 2008 2:31 AM, Enrico Sirola <[EMAIL PROTECTED]> wrote:
>> I'd like to perform linear algebra operations on float4/8 arrays...
>
> If there were a coherently designed, simple, and fast LAPACK/ MATLAB
> style library and set of datatypes for matrices and vectors in
>
On Feb 1, 2008 2:31 AM, Enrico Sirola <[EMAIL PROTECTED]> wrote:
> Hello,
> I'd like to perform linear algebra operations on float4/8 arrays.
> These tasks are tipically carried on using ad hoc optimized libraries
> (e.g. BLAS).
If there were a coherently designed, simple, and fast LAPACK/ MATLAB
Hi Colin,
Il giorno 01/feb/08, alle ore 15:22, Colin Wetherbee ha scritto:
I'm not sure about the internals of PostgreSQL (eg. the Datum
object(?) you mention), but if you're just scaling vectors,
consecutive memory addresses shouldn't be absolutely necessary. Add
and multiply operations
On Fri, Feb 01, 2008 at 11:31:37AM +0100, Enrico Sirola wrote:
> Hello,
> I'd like to perform linear algebra operations on float4/8 arrays.
> These tasks are tipically carried on using ad hoc optimized libraries
> (e.g. BLAS). In order to do this, I studied a bit how arrays are
> stored inter
Enrico Sirola wrote:
Hello,
I'd like to perform linear algebra operations on float4/8 arrays. These
tasks are tipically carried on using ad hoc optimized libraries (e.g.
BLAS). In order to do this, I studied a bit how arrays are stored
internally by the DB: from what I understood, arrays are b
Hello,
I'd like to perform linear algebra operations on float4/8 arrays.
These tasks are tipically carried on using ad hoc optimized libraries
(e.g. BLAS). In order to do this, I studied a bit how arrays are
stored internally by the DB: from what I understood, arrays are
basically a vector
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