Thanks Gilles, I'm currently trying to dive into all of this a bit and
just wondering:
Will there still be new releases of commons-math3, or is it postponed in
favor of math4?
I'm asking this because it might be an option to add erf(x) support to
Derivative structure in math3 first (as it is not ported yet), but of
course this only makes sense if it will be released some day.
Am 19.08.20 um 23:51 schrieb Gilles Sadowski:
Hi.
Le mer. 19 août 2020 à 08:38, Christoph Läubrich
<[email protected]> a écrit :
Im mostly using
- math3.analysis
In view of the next major version of CM, it would be nice
to refactor codes in that package using the JDK
java.util.function
package, e.g. replace
o.a.c.m.analysis.UnivariateFunction
with
java.util.function.DoubleUnaryOperator
and drop redundant utilities in
o.a.c.m.analysis.FuncitonUtils
- math3.fitting
- math3.linear
- math3.fitting.leastsquares
IMO, a way to modernize CM is to modularize it.
A first step could consist in "fitting" and "linear" becoming
(maven) modules.
Regards,
Gilles
And some of the common util/exception things that drip in when using the
above.
Am 14.08.20 um 18:42 schrieb Gilles Sadowski:
Le jeu. 13 août 2020 à 15:46, Christoph Läubrich
<[email protected]> a écrit :
Hi,
thnaks for the information, I'm currently using the "old" commons-math3
package, would it be possible to use erf with DerivativeStructure there?
Technically, the issue could be that the tools in the "o.a.c.m.special"
package were not designed as those in the "o.a.c.m.analysis.function"
package. And IIUC, "DerivativeStructure" builds on the latter.
But that doesn't mean it cannot be done (I've not used it personally).
A lot of work has been done on the "master" branch; a 3.7 release
would mean backporting everything; not a trivial task and (if at all
possible) it would take more time (by a tall order) than anyone is
willing to devote to that library.
IMHO, it's about time that we release v4.0 (which has been delayed
by more than 4 years, according to when the decision has been taken
to start development on that next major version).
> We are looking for volunteer maintainers for the math tools available
for commons math in general or for "commons-numbers"?
Both and more:
* Commons Geometry (spun off the "o.a.c.m.geometry" package)
* Commons Statistics (intended to replace the "o.a.c.m.stat" package)
* Commons RNG (replacement of the "o.a.c.m.random" package, and
pretty feature-complete as of v1.3).
I must confess I have only recently noticed that there is development in
commons-math-4 and might be out of date with my knowledge a bit as an
"old" math3 user :-)
Which classes/packages have you been using?
Gilles
Am 13.08.20 um 15:12 schrieb Gilles Sadowski:
Hi.
Le jeu. 13 août 2020 à 12:48, Christoph Läubrich
<[email protected]> a écrit :
I'd like to use the org.apache.commons.math3.special.Erf with a
DerivativeStructure but is seems there is no pre-defined function for
this (like exp()...).
So the question is, can Erf transformed inside a DerivativeStructure
somehow or does the DerivativeStructure need to support that function
directly?
Please note that "Erf" has been moved to the new "Commons Numbers"
component[1], along with the other Gamma-related functions.
The "DerivativeStructure" is one among several utilities that still need to
be ported (and refactored) there.[2]
We are looking for volunteer maintainers for the math tools available from
the Commons libraries. The move to more focused, smaller, components
should hopefully simplify development...
Best,
Gilles
[1]
https://gitbox.apache.org/repos/asf?p=commons-numbers.git;a=tree;f=commons-numbers-gamma/src/main/java/org/apache/commons/numbers/gamma;h=cb95316a3be45ebfcf938eab63f362f59e590fca;hb=HEAD
[2] https://issues.apache.org/jira/browse/NUMBERS-69
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