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Posted to issues@commons.apache.org by "Gilles (JIRA)" <ji...@apache.org> on 2011/01/28 00:57:56 UTC
[jira] Created: (MATH-503) Common mathematical functions
Common mathematical functions
-----------------------------
Key: MATH-503
URL: https://issues.apache.org/jira/browse/MATH-503
Project: Commons Math
Issue Type: Wish
Reporter: Gilles
Assignee: Gilles
Priority: Minor
Fix For: 3.0
I propose to add some functions in the package {{analysis.function}}:
* [Generalized logistic|http://en.wikipedia.org/wiki/Generalised_logistic_function]
* [Step|http://en.wikipedia.org/wiki/Step_function]
* [Gaussian|http://en.wikipedia.org/wiki/Gaussian_function]
Other suggestions?
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[jira] Commented: (MATH-503) Common mathematical functions
Posted by "Luc Maisonobe (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MATH-503?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12998752#comment-12998752 ]
Luc Maisonobe commented on MATH-503:
------------------------------------
Seems a good idea to me.
Not sure about the name, perhaps something along the line of ScaledLogit ?
> Common mathematical functions
> -----------------------------
>
> Key: MATH-503
> URL: https://issues.apache.org/jira/browse/MATH-503
> Project: Commons Math
> Issue Type: Wish
> Reporter: Gilles
> Assignee: Gilles
> Priority: Minor
> Fix For: 3.0
>
>
> I propose to add some functions in the package {{analysis.function}}:
> * [Generalized logistic|http://en.wikipedia.org/wiki/Generalised_logistic_function]
> * [Step|http://en.wikipedia.org/wiki/Step_function]
> * [Gaussian|http://en.wikipedia.org/wiki/Gaussian_function]
> Other suggestions?
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[jira] Commented: (MATH-503) Common mathematical functions
Posted by "Gilles (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MATH-503?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12998586#comment-12998586 ]
Gilles commented on MATH-503:
-----------------------------
{quote}
Other suggestions?
{quote}
Yes. ;-)
I'd like to implement the logit function:
{noformat}
log((x - a) / (b - x))
{noformat}
This is more general than [Logit|http://en.wikipedia.org/wiki/Logit]. Can I still name the class "Logit"? Would another name be more appropriate?
The intention is that this function, together with a similar generalization of the "Sigmoid" class, can be used to transform an interval [a, b] to (-inf, +inf). This is just what is needed to simulate simple constraints for use with the CM optimizers.
> Common mathematical functions
> -----------------------------
>
> Key: MATH-503
> URL: https://issues.apache.org/jira/browse/MATH-503
> Project: Commons Math
> Issue Type: Wish
> Reporter: Gilles
> Assignee: Gilles
> Priority: Minor
> Fix For: 3.0
>
>
> I propose to add some functions in the package {{analysis.function}}:
> * [Generalized logistic|http://en.wikipedia.org/wiki/Generalised_logistic_function]
> * [Step|http://en.wikipedia.org/wiki/Step_function]
> * [Gaussian|http://en.wikipedia.org/wiki/Gaussian_function]
> Other suggestions?
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[jira] Commented: (MATH-503) Common mathematical functions
Posted by "Gilles (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MATH-503?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12991339#comment-12991339 ]
Gilles commented on MATH-503:
-----------------------------
Gaussian function added in revision 1067917.
> Common mathematical functions
> -----------------------------
>
> Key: MATH-503
> URL: https://issues.apache.org/jira/browse/MATH-503
> Project: Commons Math
> Issue Type: Wish
> Reporter: Gilles
> Assignee: Gilles
> Priority: Minor
> Fix For: 3.0
>
>
> I propose to add some functions in the package {{analysis.function}}:
> * [Generalized logistic|http://en.wikipedia.org/wiki/Generalised_logistic_function]
> * [Step|http://en.wikipedia.org/wiki/Step_function]
> * [Gaussian|http://en.wikipedia.org/wiki/Gaussian_function]
> Other suggestions?
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[jira] Commented: (MATH-503) Common mathematical functions
Posted by "Gilles (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MATH-503?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12989170#comment-12989170 ]
Gilles commented on MATH-503:
-----------------------------
Step function added in revision 1066018.
> Common mathematical functions
> -----------------------------
>
> Key: MATH-503
> URL: https://issues.apache.org/jira/browse/MATH-503
> Project: Commons Math
> Issue Type: Wish
> Reporter: Gilles
> Assignee: Gilles
> Priority: Minor
> Fix For: 3.0
>
>
> I propose to add some functions in the package {{analysis.function}}:
> * [Generalized logistic|http://en.wikipedia.org/wiki/Generalised_logistic_function]
> * [Step|http://en.wikipedia.org/wiki/Step_function]
> * [Gaussian|http://en.wikipedia.org/wiki/Gaussian_function]
> Other suggestions?
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[jira] [Resolved] (MATH-503) Common mathematical functions
Posted by "Gilles (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MATH-503?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Gilles resolved MATH-503.
-------------------------
Resolution: Fixed
> Common mathematical functions
> -----------------------------
>
> Key: MATH-503
> URL: https://issues.apache.org/jira/browse/MATH-503
> Project: Commons Math
> Issue Type: Wish
> Reporter: Gilles
> Assignee: Gilles
> Priority: Minor
> Fix For: 3.0
>
>
> I propose to add some functions in the package {{analysis.function}}:
> * [Generalized logistic|http://en.wikipedia.org/wiki/Generalised_logistic_function]
> * [Step|http://en.wikipedia.org/wiki/Step_function]
> * [Gaussian|http://en.wikipedia.org/wiki/Gaussian_function]
> Other suggestions?
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[jira] Commented: (MATH-503) Common mathematical functions
Posted by "Gilles (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MATH-503?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12999855#comment-12999855 ]
Gilles commented on MATH-503:
-----------------------------
Class "Logit" implemented in revision 1074954.
> Common mathematical functions
> -----------------------------
>
> Key: MATH-503
> URL: https://issues.apache.org/jira/browse/MATH-503
> Project: Commons Math
> Issue Type: Wish
> Reporter: Gilles
> Assignee: Gilles
> Priority: Minor
> Fix For: 3.0
>
>
> I propose to add some functions in the package {{analysis.function}}:
> * [Generalized logistic|http://en.wikipedia.org/wiki/Generalised_logistic_function]
> * [Step|http://en.wikipedia.org/wiki/Step_function]
> * [Gaussian|http://en.wikipedia.org/wiki/Gaussian_function]
> Other suggestions?
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[jira] Commented: (MATH-503) Common mathematical functions
Posted by "Gilles (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MATH-503?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12998895#comment-12998895 ]
Gilles commented on MATH-503:
-----------------------------
I'd favour the name "Logit" and make the default constructor create the usual logit function, i.e. with a = 0 and b = 1. IMO, something like
{noformat}
ScaledLogit logit = new ScaledLogit();
ScaledLogit scaledLogit = new ScaledLogit(a, b);
{noformat}
seems less clear than
{noformat}
Logit logit = new Logit();
Logit scaledLogit = new Logit(a, b);
{noformat}
> Common mathematical functions
> -----------------------------
>
> Key: MATH-503
> URL: https://issues.apache.org/jira/browse/MATH-503
> Project: Commons Math
> Issue Type: Wish
> Reporter: Gilles
> Assignee: Gilles
> Priority: Minor
> Fix For: 3.0
>
>
> I propose to add some functions in the package {{analysis.function}}:
> * [Generalized logistic|http://en.wikipedia.org/wiki/Generalised_logistic_function]
> * [Step|http://en.wikipedia.org/wiki/Step_function]
> * [Gaussian|http://en.wikipedia.org/wiki/Gaussian_function]
> Other suggestions?
--
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[jira] Commented: (MATH-503) Common mathematical functions
Posted by "Gilles (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MATH-503?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12988522#action_12988522 ]
Gilles commented on MATH-503:
-----------------------------
Generalized logistic and sigmoid functions added in revision 1065146.
> Common mathematical functions
> -----------------------------
>
> Key: MATH-503
> URL: https://issues.apache.org/jira/browse/MATH-503
> Project: Commons Math
> Issue Type: Wish
> Reporter: Gilles
> Assignee: Gilles
> Priority: Minor
> Fix For: 3.0
>
>
> I propose to add some functions in the package {{analysis.function}}:
> * [Generalized logistic|http://en.wikipedia.org/wiki/Generalised_logistic_function]
> * [Step|http://en.wikipedia.org/wiki/Step_function]
> * [Gaussian|http://en.wikipedia.org/wiki/Gaussian_function]
> Other suggestions?
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