[jira] [Created] (MATH-794) LP on android devices

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[jira] [Created] (MATH-794) LP on android devices

Gary D. Gregory (Jira)
Sylvain Roussé created MATH-794:
-----------------------------------

             Summary: LP on android devices
                 Key: MATH-794
                 URL: https://issues.apache.org/jira/browse/MATH-794
             Project: Commons Math
          Issue Type: Bug
    Affects Versions: 3.0
         Environment: Android 2.2 JDK 1.6
            Reporter: Sylvain Roussé


When I express a Linear Programming problem in a Pure Java environment, I get a solution A.

When I express thje same linear programming problem in a Java Android environment using the same problem modelling classes, I get a solution A', which doesn't match the constraints I express.

For instance, If I have a set of Xi variables, with each Xi >= 0, I can get some Xj < 0.

Or if I have Xi >= a, then in the solution, I can have Xi < a.

I noticed that for freechart library, they have made a special library for android (Jfreecharrtt for pure javan Afreechart for Android).

I have tried to compile the source with my android app, but the problem is the same.

Is it necessary to have a library built up for android devices ?

Is it possible to have commons-math for android ?

In advance thanks.

Regards.

Sylvain.

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[jira] [Commented] (MATH-794) LP on android devices

Gary D. Gregory (Jira)

    [ https://issues.apache.org/jira/browse/MATH-794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13285588#comment-13285588 ]

Luc Maisonobe commented on MATH-794:
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Apache Commons Math should run on Android, as long as you package it as a dex file.
There is an exemple here: [https://www.orekit.org/forge/projects/socis-2011/wiki/HowToBuildToAndroid],
based on another Java library (Orekit), which depends on Apache Commons Math.

Can you reproduce the error with a really simple (say less than 100 lines of code) standalone application that could be run both on Android from the command line with dalvikvm (look at the exemple in the wiki page above, in the "easy way" section) and on a desktop environment?
               

> LP on android devices
> ---------------------
>
>                 Key: MATH-794
>                 URL: https://issues.apache.org/jira/browse/MATH-794
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 3.0
>         Environment: Android 2.2 JDK 1.6
>            Reporter: Sylvain Roussé
>              Labels: android
>
> When I express a Linear Programming problem in a Pure Java environment, I get a solution A.
> When I express thje same linear programming problem in a Java Android environment using the same problem modelling classes, I get a solution A', which doesn't match the constraints I express.
> For instance, If I have a set of Xi variables, with each Xi >= 0, I can get some Xj < 0.
> Or if I have Xi >= a, then in the solution, I can have Xi < a.
> I noticed that for freechart library, they have made a special library for android (Jfreecharrtt for pure javan Afreechart for Android).
> I have tried to compile the source with my android app, but the problem is the same.
> Is it necessary to have a library built up for android devices ?
> Is it possible to have commons-math for android ?
> In advance thanks.
> Regards.
> Sylvain.

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[jira] [Resolved] (MATH-794) LP on android devices

Gary D. Gregory (Jira)
In reply to this post by Gary D. Gregory (Jira)

     [ https://issues.apache.org/jira/browse/MATH-794?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Luc Maisonobe resolved MATH-794.
--------------------------------

    Resolution: Invalid

According to user, a simpler problem provided the same result on Android and desktop environment. So the problem was elsewhere.
               

> LP on android devices
> ---------------------
>
>                 Key: MATH-794
>                 URL: https://issues.apache.org/jira/browse/MATH-794
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 3.0
>         Environment: Android 2.2 JDK 1.6
>            Reporter: Sylvain Roussé
>              Labels: android
>
> When I express a Linear Programming problem in a Pure Java environment, I get a solution A.
> When I express thje same linear programming problem in a Java Android environment using the same problem modelling classes, I get a solution A', which doesn't match the constraints I express.
> For instance, If I have a set of Xi variables, with each Xi >= 0, I can get some Xj < 0.
> Or if I have Xi >= a, then in the solution, I can have Xi < a.
> I noticed that for freechart library, they have made a special library for android (Jfreecharrtt for pure javan Afreechart for Android).
> I have tried to compile the source with my android app, but the problem is the same.
> Is it necessary to have a library built up for android devices ?
> Is it possible to have commons-math for android ?
> In advance thanks.
> Regards.
> Sylvain.

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