Bill Barker a écrit :
> I've recently come up with a need in my day-job for a
> SparseMatrix/SparseVector implementation, so would would like to offer to
> help on this project. I should still have karma for commons (my Apache id
> is [EMAIL PROTECTED] for those that haven't been around since m
I've recently come up with a need in my day-job for a
SparseMatrix/SparseVector implementation, so would would like to offer to
help on this project. I should still have karma for commons (my Apache id
is [EMAIL PROTECTED] for those that haven't been around since my last commons
commit. I'm pr
Ok, thanks very much.
-sujit
On Wed, 2008-12-03 at 22:53 +0100, Luc Maisonobe wrote:
> Sujit Pal a écrit :
> > Thanks, added it to JIRA:
> > https://issues.apache.org/jira/browse/MATH-231
> >
> > Also, please let me know if you want me to go ahead and submit a patch
> > for this.
>
> No, this i
Sujit Pal a écrit :
> Thanks, added it to JIRA:
> https://issues.apache.org/jira/browse/MATH-231
>
> Also, please let me know if you want me to go ahead and submit a patch
> for this.
No, this is not needed, thanks.
>
> I also noticed that MATH-230 is open/unassigned. The patch is already
> in,
Thanks, added it to JIRA:
https://issues.apache.org/jira/browse/MATH-231
Also, please let me know if you want me to go ahead and submit a patch
for this.
I also noticed that MATH-230 is open/unassigned. The patch is already
in, so all that remains is to review it before deciding to check in or
no
Sujit Pal a écrit :
> I've updated MATH-230 with a fresh patch (this time against trunk, since
> MATH_2_0 has been moved to trunk) putting back the fallback code Luc
> pointed out was used for performance.
Thanks.
>
> Details are in the bug:
> http://issues.apache.org/jira/browse/MATH-230
>
> T
I've updated MATH-230 with a fresh patch (this time against trunk, since
MATH_2_0 has been moved to trunk) putting back the fallback code Luc
pointed out was used for performance.
Details are in the bug:
http://issues.apache.org/jira/browse/MATH-230
There are also some test times for running with
- "Ted Dunning" <[EMAIL PROTECTED]> a écrit :
> Is performance in LUD normally achieved by fast element access? Or is
> it
> done by using higher order operators on a view of a row (or column)?
This is not used for LUD but only for simpler operations (multiplication,
addition, subtraction)
Hi Luc,
Thanks for the feedback. I did not realize that the check for the
ClassCastException was performance related. Let me know your thoughts
once you get a chance to look at the patch, and I can put this back in
and resubmit, ie if it is a RealMatrixImpl, then do what the methods
with RealMatri
Is performance in LUD normally achieved by fast element access? Or is it
done by using higher order operators on a view of a row (or column)?
I know the the Colt package made the argument that the latter it far
preferable. I also know that Jama didn't do this, but was very hard to
extend as a re
Sujit Pal a écrit :
> Hello,
>
> I am a new, but fairly happy user of commons-math 1.2 and I have begun
> to use it in my code. I needed a sparse matrix implementation for some
> data analysis work I was doing, and unfortunately the code with
> RealMatrixImpl was coming back with an OOME. So I bui
This is often handled by using an offset sparse matrix or vector that is
sparse in that only elements different from the offset are stored. You can
often do this at the algorithmic level by carrying around the requisite
constant matrix in your derivation. Obviously, a normal sparse matrix is a
sp
Hi Ted,
I considered that possibility too, peeked at one of the posts where this
representation was suggested :-).
Pros:
1) the representation is more elegant.
Cons:
1) it would have required me to implement SparseVector, which we should
do anyway, imo. But I wanted to keep the code changes to a
Sujit,
What do you think the trade-offs are between the representation that you
used and another one where you have a Map that contains
rows or columns?
On Mon, Dec 1, 2008 at 1:40 PM, Sujit Pal <[EMAIL PROTECTED]> wrote:
> Hello,
>
> I am a new, but fairly happy user of commons-math 1.2 and I h
Hello,
I am a new, but fairly happy user of commons-math 1.2 and I have begun
to use it in my code. I needed a sparse matrix implementation for some
data analysis work I was doing, and unfortunately the code with
RealMatrixImpl was coming back with an OOME. So I built a
SparseRealMatrixImpl as a s
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